In this article
During a prolonged crisis—an extended power outage, supply disruption or regional isolation—essential needs quickly become the practical priority. Water, food and health are the three pillars of a household’s ability to function independently for several days or weeks.
These three dimensions are interdependent: without enough safe drinking water, health deteriorates rapidly; without adequate food, judgement and the ability to act decline; without hygiene and basic care, infection risks increase. This article covers practical strategies for each priority, paying particular attention to conditions in Quebec.
Drinking water: storage and purification
Access to safe water is a priority, but no survival countdown can calculate an individual’s needs. Heat, physical exertion, illness and treatments can change the situation. Disrupted transport does not automatically mean falling water pressure or contamination of the supply network: check municipal information and the nature of any notice. Clear water is not proof that it is safe to drink.
Assessing and building water supplies
The PrépaCivile storage scenario starts with two litres per person per day for drinking, plus two litres for food preparation and minimal hygiene. This is a planning reference to adapt, rather than a medical prescription for fluid intake. For four people, it represents 48 litres for three days, 224 litres for two weeks and 480 litres for thirty days. The historical figure of 112 litres for four people over two weeks was therefore an arithmetic error. Distribute the containers and check space, accessibility and the load that the supporting surface can bear.
Before an announced interruption, and only while the water remains authorized for the intended use, you can prepare an additional reserve. Preferably keep bathtub or sink water for permitted non-food uses; their surfaces and product residues are not controlled in the same way as a clean food-grade container. A WaterBOB-style bathtub reservoir is a separate product: its manufacturer states a capacity of up to 100 US gallons, approximately 379 litres, rather than 450 litres. The actual possible volume depends on the bathtub and the instructions; filling time depends on the flow rate. The product does not treat contaminated water.
For portable supplies, use clean, closed food-grade containers that have never held chemicals. A filled 20–25-litre jerrycan already weighs about 20–25 kg before the container’s own weight; a smaller capacity may better suit your mobility. Record the filling date, protect the water from heat and light, and follow the source’s or supplier’s replenishment recommendations, without promising a universal six-to-twelve-month storage life.
Purification methods
Choose treatment according to the identified hazard and local instructions. Boiling, tablets and filters do not provide the same protection. For chemical contamination or a do-not-consume notice, do not assume that household treatment makes the water usable: plan another authorized source. Running out of supplies should also prompt you to ask where to obtain water, rather than treating whatever water happens to be available.
Boiling
Boiling can address a microbiological hazard when authorities recommend it. In Quebec, follow the duration and uses specified in the notice; boil-water instructions usually call for a rolling boil for one minute. Altitude can change recommendations in other regions. Let the water cool in a clean container without creating a burn risk. Boiling does not remove every chemical and does not resolve a do-not-use notice.
Chemical treatment
Treatment tablets have their own composition, dose, contact time and limitations. Read the instructions, particularly for cold or cloudy water and any contraindications. The historical formula of two drops of bleach per litre is not a rule for every product, because concentrations and additives differ. Consult official instructions matching the exact product and situation, rather than using detergent, scented bleach or an improvised dose. Some parasites resist commonly used treatments.
Filtration
Filtration: compare the exact model, targeted contaminants, tests or certifications, operating conditions and maintenance. Sawyer, LifeStraw and Katadyn product ranges are not all equivalent; a device that captures certain protozoa does not necessarily remove viruses or chemical pollutants. Reverse osmosis also has limitations and technical requirements. A homemade arrangement of sand, gravel or charcoal may clarify water without demonstrating that it is safe to drink.
In Quebec’s boreal forest, finding a stream guarantees neither access nor water safety. A clear appearance does not reveal every hazard. Depending on the water and equipment, complementary steps may be needed, but randomly combining a filter and a chemical does not provide complete protection against every contaminant. Before travelling, choose a validated method for the risks you anticipate and retain an alternative, rather than discovering the method’s limitations when your supplies are empty.
Food: inventory, rationing and preservation
Food management means taking stock of what can actually be eaten, planning meals according to needs and maintaining food-safety conditions. Making supplies last does not mean arbitrarily reducing a child’s, a sick person’s or an active adult’s intake. Choose and learn preservation techniques before needing them; a power outage does not turn unsafe food into material that can be salvaged.
Inventory of provisions
Take stock of canned goods, dry foods, fresh products and frozen foods without assuming that every household already has several weeks’ supply. Note quantities, dates, allergies and the water or energy needed for preparation. The following classification is an organizational reference to adjust according to actual temperatures, packaging and public-health instructions:
Consume First
- Fresh products (vegetables, fruit, dairy products)
- Frozen foods: keep them cold and monitor the temperature. Do not remove everything to cook it pre-emptively; safety depends on more than the number of hours since the outage.
- Bread and bakery products
- Foods approaching a labelled date: distinguish a best-before or minimum-durability date from an applicable expiry date and from instructions after opening. The label does not replace checking packaging integrity and storage conditions.
Intermediate reserve
- Canned goods: vegetables, legumes, fish and meat
- Pasta, rice, semolina and cereals
- Oils and fats
- Coffee, tea, sugar, salt
Long-term reserve
- Dry legumes (lentils, beans, chickpeas)
- Dehydrated fruit and vegetables
- Freeze-dried foods
- Honey keeps for a long time when stored correctly, without implying an absolute guarantee. Do not give honey to an infant under one year old, even in a cooked preparation.
- Drinking alcohol: a food product does not become a suitable wound or surface disinfectant simply because it is called “strong alcohol.” Distinguish concentrations, formulations and uses; do not count on a bottle of spirits as a care supply.
Reasoned rationing
Energy needs vary with age, body size, activity, pregnancy, health and environmental conditions. The historical 2,000–2,500 kcal range is not a prescription for every adult, and staying home does not automatically justify restricting intake. Plan meals supplying energy, protein, variety and appropriate amounts. Allergies, diabetes, kidney disease and infant feeding must be considered immediately, rather than waiting for a hypothetical time when a deficiency might appear.
No general principle makes two large meals better than three smaller ones. Organize eating according to habits, health needs and available preparation options. Snacks may be necessary, particularly for some treatments or for children. If quantities become insufficient, seek supplies or assistance rather than imposing an eating pattern presented as medically superior.
Preservation techniques
In the absence of refrigeration, several techniques can be used to extend the life of food. Their effectiveness varies depending on the availability of ingredients and equipment.
Salting and drying
Salting and drying require a tested process: salt quantity, thickness, temperature, duration and storage form a complete method. Salting meat or fish or leaving it to air-dry does not guarantee safety. Do not improvise a recipe to rescue a product whose cold chain has failed. Instead, prepare commercially shelf-stable foods and learn a suitable method before the crisis.
Lacto-fermentation
Lacto-fermentation: follow a tested recipe for the particular vegetable, including its proportions, temperatures, equipment and storage conditions. “Salt and an airtight container” is not a sufficient protocol, and an unsuitable closure can cause gas-related problems. This description alone cannot justify promises of several months’ storage or systematic nutritional improvements. Smell or bubbles do not establish safety.
Home canning
Canning methods differ according to acidity and the recipe. Low-acid vegetables and meats require a tested pressure-canning process using suitable equipment; simple boiling or a pressure cooker not designed for that purpose is not a substitute. For jams and fruit compotes too, follow a validated recipe and its processing and storage conditions, without automatically describing a closed jar as “sterilized.”
Storage in a cellar or cool pantry
Cellar or cool pantry: each product needs particular temperature, humidity and ventilation conditions. Potatoes, carrots, onions, garlic and apples do not all share the same ideal environment. A room at 8–12 °C does not ensure several months’ storage for every product in this group. Check the food, remove deteriorating items and avoid turning a damp room or one affected by a sewage backup into a food store.
Health and hygiene
A crisis may disrupt care, treatment access, water and hygiene. Digestive infections, wound problems and complications of chronic illness deserve preparation, but this article has no data ranking them as the most frequent conditions in every prolonged crisis. A kit does not prevent all these problems; referral to professionals and accessible services remains essential.
Medication and prescriptions
Continuity of long-term treatment is an important point to prepare, without evidence here ranking it as the most frequently overlooked need. A crisis when a prescription is due for renewal, for example at month-end, can quickly become critical for someone treated for hypertension, diabetes, epilepsy or a psychiatric condition. Identifying the actual renewal date and contacts before an interruption is more useful than assuming that every prescription follows the same calendar.
In Quebec, a pharmacist may consider extending a prescription, using professional judgement and applicable regulations, to avoid interrupting treatment. This activity is not available only after an official disaster declaration, and does not guarantee identical renewal for everyone. Discuss renewals, storage, cold-chain requirements and an alternative if your pharmacy becomes inaccessible beforehand, without changing doses yourself.
Choose over-the-counter supplies with a pharmacist according to household members’ needs. Acetaminophen, ibuprofen, antihistamines, antidiarrhoeals, antacids and antiseptics have different indications, contraindications and interactions; having them does not automatically cover most health problems. Follow the label, packaging and expiry date. Studies conducted under other conditions do not establish an extended usable life for a medicine stored at home.
First aid kit
Basic content
- Bandages and dressings in different sizes
- Sterile pads and gauze bandages
- Care products: choose appropriate products and their uses with a professional, including chlorhexidine or povidone-iodine. They are not applied indiscriminately to every wound or mucous membrane.
- 70% isopropyl alcohol: keep it labelled, out of children’s reach and away from flames. It must not be drunk or routinely poured into a wound; follow the manufacturer’s intended use.
- Scissors, tweezers and non-latex disposable gloves
- Thermometer
- Respiratory protection: choose a suitable model, worn correctly and compatible with the people concerned. FFP2 and N95 follow distinct standards; neither protects against every gas or makes a dangerous atmosphere safe to breathe.
Associated skills
- Wounds: learn first aid actions and the limits of self-care. Cleaning, dressings and bleeding control do not replace assessment when an injury is deep, serious, contaminated or worsening.
- Cardiopulmonary resuscitation (CPR): Red Cross or St. John Ambulance training
- Recognition of signs of skin infection (progressive redness, heat, pus)
- Rehydration: keep a suitable commercial solution and know when to seek medical help. Drowsiness, difficulty drinking or concerning signs cannot be managed simply by following a recipe without assessment.
Hygiene when normal services are disrupted
Hand hygiene is an important preventive measure alongside safe water and food practices. Prefer soap and water whenever possible, especially when hands are visibly dirty. A hand sanitizer containing at least 60% alcohol can be useful, but is not equivalent in every situation. Using it does not remove the need to clean away dirt and prevent cross-contamination.
For a partial body wash, provide a clean container, water authorized for that use and personal items. The quantity needed varies; one litre is not a standard guaranteeing complete hygiene. Avoid burns from heated water and distinguish body wipes from surface disinfectants. Do not flush wipes down the toilet, even when advertised as disposable.
Plan sanitation: if sewers or a pump stop working, stop the affected uses and request local instructions. A temporary arrangement may need a stable seat, suitable bags, a closed container and hand hygiene, but is not automatically sufficient for every household. Absorbent materials limit some leakage without disinfecting excrement. Do not compost it in the garden or bury it in an urban area; arrange collection and treatment according to public-health and municipal instructions.
Obtaining supplies locally
Farms, markets and gardens can be useful contacts to identify before a disruption. However, their production, opening, stocks and access conditions may also be affected. A shared garden is not a self-service reserve; exchanges require agreement and respect for food safety. These resources complement a plan without guaranteeing supplies for an entire neighbourhood.
Local plant resources
- Community gardens and urban farms — identifying the closest before the crisis
- Vegetable gardening: some leafy vegetables can produce in a few weeks depending on species and conditions. A 30–45-day period does not apply to every crop and does not meet an immediate food need during a winter crisis.
- Wild plants: learn reliable identification before a crisis, including risks of confusion, contamination and harvesting rules. Dandelion, wild garlic, nettle and cattail are not a list to use without knowledge; European wild garlic cannot simply be assumed to match Montreal’s flora.
- Exchange of seeds and plants with the neighbourhood
Local animal resources
- Hunting and fishing: permits, species, seasons, areas, access rights and other rules remain to be checked with the authorities. A difficult situation does not abolish obligations and does not announce a future derogation. Do not rely on a hypothetical change by decree to plan your meals.
- Fishing in an accessible waterway: a practical skill to develop before a situation of need
- Trapping is a regulated activity requiring checks on permits, training, territories and applicable rules. Describing it as regulated only “in normal times” would be misleading; do not improvise traps in a neighbourhood during a supply interruption.
- Keeping animals: hens or rabbits require consideration of local rules, space, care, feed, water and hygiene. This is not a quick solution to introduce during a shortage, and household production does not remove animal health and welfare requirements.
Knowledge of your immediate surroundings is an asset developed before a crisis. Identifying vegetable farms within a 20 km radius, knowing which waterways can be reached on foot, having tried even a modest vegetable garden, and knowing neighbours with complementary skills or resources all build a capacity for resilience that equipment alone cannot replace.
Staying informed without relying on the internet
Internet and telephony depend on equipment, power supply and connections that can be affected differently. The duration or speed of degradation is not predictable from the closure of bridges alone. Prepare contacts on paper and complementary solutions, without announcing as certain a simultaneous collapse of all networks.
Resilient sources of information
- Battery-powered or hand-crank AM/FM radio: check the local stations you can receive and the batteries. Canada’s former Weatheradio service closed on March 16, 2026; a “weather” feature on a radio’s packaging therefore does not guarantee local reception of that service.
- Shortwave: reception depends on stations, antenna, location and propagation conditions. It can complement some uses without guaranteeing local emergency instructions or international reception at every hour.
- Two-way radios: use devices and services authorized in the country concerned. Advertised FRS/GMRS ranges are not guaranteed urban distances; Canadian rules do not transfer to France or every programmable device.
- Amateur radio is a regulated practice requiring applicable qualifications and operating conditions. Local groups may take part in organized arrangements, but no single network is automatically activated or accessible to everyone buying a radio. Prepare a realistic contact method with the people actually involved.
Information to keep on paper
- Regional and local road map (paper format)
- Emergency contacts (physician, pharmacist, relatives) — memorized or recorded
- Contact details for municipal emergency reception or accommodation centres
- Numbers of local essential services (water, gas, electricity)
- Basic first aid protocols
Summary
Immediate priorities (0–72 h)
- Water: Verify notices and prepare clean food containers if filling remains permitted. Identify water for non-food uses separately.
- Inventory existing food supplies and establish an order of use
- Check stocks of medicines and identify critical treatments not to be interrupted
- Activate the family communication plan and test radio equipment
Medium-term organization (72 hours – 2 weeks)
- Supply: follow distribution points and notices, or use a validated process for the identified hazard. A filter is not a universal response to contamination.
- Meals: allocate reserves according to actual needs and seek assistance when quantities become insufficient, without imposing arbitrary restrictions.
- Identify local supply sources (farms, gardens, barter)
- Hygiene: maintain hand-cleaning arrangements, safe water, food safety and waste management, without treating one measure as sufficient on its own.
What Can Wait
- Advanced preservation: learn methods and obtain equipment before a crisis. The second week is not a public-health trigger; do not start an unfamiliar method to salvage food that is already unsafe.
- Nutrition: Take special needs, allergies and treatments into account from the outset. Do not promise several weeks without consequences of an inappropriate diet.
- Organisation of local food production — a phase 2 priority, not an immediate emergency
Prior preparation
- Supplies: begin with an achievable goal, then increase it if space and resources allow. Two weeks here represents 224 litres for four people in the planning scenario of four litres per person per day.
- Have a portable water filter and accessible purification tablets
- Maintain a rolling stock of non-perishable foods covering two to four weeks
- Medication: agree on a plan with the pharmacist and follow dispensing and storage rules. Two weeks is neither an obligation for everyone nor a quantity everyone can obtain automatically.
- Train at least one household member in basic first aid
Frequently Asked Questions
How long is the water stored in a bathtub still usable?
Bathtub supplies have no universal safe storage period. Open water may receive residues and contamination; keep it for authorized non-food uses and reserve food-grade containers for drinking and cooking. For a WaterBOB-style reservoir, follow the exact model’s instructions and its filling, use and storage conditions. A closed liner does not disinfect its contents. The manufacturer states up to 100 US gallons, approximately 379 litres, subject to bathtub capacity; do not infer several weeks of guaranteed drinking-water safety.
How long does a refrigerator remain safe without power?
Outages and the cold chain: use a thermometer and limit door opening. Quebec guidance indicates approximately four to six hours of cold retention for a refrigerator, and up to 48 hours for a full freezer in good condition, or 24 hours when half full. These are condition-dependent references, rather than an automatic extension of food safety. Sort products according to temperature and the categories in official instructions. Unsafe food must not be “eaten or cooked immediately” as a rescue measure; cooking does not neutralize every hazard. Do not taste food to test it.
How to maintain sanitary hygiene if toilets no longer work?
Temporary toilets: A stable container equipped with appropriate bags can be used to collect excrement when facilities are unavailable, provided that hygiene, closure, secure storage and waste disposal are organized. Keep them away from water, food, children and animals. The litter or sawdust absorbs without rendering the contents harmless. Do not bury bags or feces in urban land and do not add them to domestic compost. Ordinary collection may be permitted or prohibited according to local instructions: request the applicable instruction instead of stating that it will necessarily be unavailable.
What is the actual life of canned foods?
Canned foods: distinguish a best-before label from an expiry date applicable to a particular product. Quality depends on manufacture, packaging and storage. The former general safety claim of two to five years after the date, attributed to unidentified studies, must not guide decisions. Discard swollen, leaking or damaged cans and food whose safety is doubtful; normal appearance or smell does not prove the absence of danger. Home-canned food depends on its validated process, rather than the guidance for commercially canned food.
How can you prepare a homemade oral rehydration solution?
Rehydration: the historical version proposed one litre of water, six teaspoons of sugar and half a teaspoon of salt, attributing it to “the basic WHO formulation.” This sugar-and-salt preparation is not equivalent to the complete composition of an oral rehydration salts (ORS) sachet; accurate measurements and clinical needs matter. Prefer an appropriate commercial solution prepared exactly according to its instructions. In Quebec, consult the official emergency recipe and instructions on the gastroenteritis page rather than altering proportions from a recipe circulating online. For a child, a vulnerable person, inability to drink or worsening symptoms, seek professional advice promptly; a recipe does not replace urgent care.
Water
The 9 methods of water purification
Detailed comparison of available purification methods based on targeted contaminants and field conditions.
Health
First Aid Supplies Checklist
Full contents of a first aid kit adapted to prolonged emergency situations.
Food
Preserving food
Methods and equipment for building and maintaining long-term food reserves.
Useful sources and approaches
- Quebec: contamination or shortage of drinking water.
- Quebec: sorting food after an outage or flood.
- Ordre des pharmaciens du Québec: prescriptions.
- Quebec: hydration and rehydration during gastroenteritis.
- Public Health Agency of Canada: Hand hygiene.
- WaterBOB: manufacturer's announced capacity, which must be distinguished from drinking-water certification or a PrépaCivile test.
The durations and phases are used to organize the reflection; a danger, a medical need or an evacuation instruction must not wait until the next phase.