Emergencies · Canada

Preparing for a heatwave

What matters most in a heatwave, what official guidance in Canada says, and long-life food that suits it.

By the SupKit teamUpdated 3 min read

The short answer

In a heatwave, the things that matter most are drinking water, essential medication, emergency contacts, first aid kit. Keep an eye on local forecasts and heat alerts so you know when to take extra care.1

What matters most

  • Drinking water Essential
    3 litres per person per day for drinking is the commonly recommended amount.
  • Essential medication Essential
    A supply of any medication your household relies on.
  • Emergency contacts Essential
    Important numbers saved where you can reach them without the internet.
  • First aid kit Essential
    A stocked first aid kit that everyone knows where to find.
  • Water for pets Essential
    An estimate based on each pet's species and size.
  • Plan for medication that needs a fridge Essential
    Know how you'd keep it cool during a power outage.

What official guidance in Canada says

  • Keep an eye on local forecasts and heat alerts so you know when to take extra care.1
  • Find an air-conditioned place nearby where you can cool down on very hot days.1
  • Arrange for family, friends or neighbours to drop in regularly during very hot days.1
  • Drink plenty of water, and start before you feel thirsty.1
  • Keep the sun out during the day by closing curtains, blinds or awnings.1

Stay safe

Water and food for a few days

For two adults, SupKit's figures for 3 days are:

3 days
Drinking water18 L
Food energy13,500 calories

Long-life food that suits a heatwave

Each of these keeps without a fridge and doesn't need the fridge once opened:

  • Canned chili
  • Canned soup
  • Baked beans
  • Microwave rice pouch
  • Canned tuna
  • Crackers
  • Peanut butter
  • Dried fruit and nuts
  • Granola bars
  • Canned fruit

Allergies, dietary needs and children

Plan around everyone at home: allergies, intolerances and diets come first, and familiar food matters most for children. Recipes vary between brands, so always read the label of the product you buy.

FoodTypical allergensTypically suitable for
Canned chilivaries by recipecheck the label
Canned soupvaries by recipevegetarian
Baked beansnone of the main allergens in its main ingredientvegan
Microwave rice pouch 250gnone of the main allergens in its main ingredientvegan
Canned tunafishcheck the label
Crackerscereals containing glutenvegan
Peanut butterpeanutsvegan, gluten free
Dried fruit and nutstree nutsvegan, gluten free
Granola barsvaries by recipevegetarian
Canned fruitnone of the main allergens in its main ingredientvegan, gluten free

Typical allergens and diets are SupKit's guide to the main ingredient, not a product's label.

  • Canada names 11 priority allergens: eggs, milk, mustard, peanuts, crustaceans and molluscs, fish, sesame, soy, sulphites, tree nuts, and wheat and triticale.2
  • Packaged foods must declare priority allergens and gluten sources by plain source names in the ingredient list, a 'Contains' statement, or both.3
  • Companies may add a 'May contain' warning for possible cross-contamination; it is not a substitute for good manufacturing practices.3

Young children

  • Health Canada says peanuts and other nuts, seeds, popcorn and hard candies are not safe for children under four.4
  • Never give any kind of honey to babies under one, including in food, water, formula or on a soother.5
  • Prepare food for young children with little or no added salt or sugar.4

Questions

What do I need for a heatwave?

Drinking water, Essential medication, Emergency contacts, First aid kit, Water for pets, Plan for medication that needs a fridge.

How do I stay safe in a heatwave?

Fans may feel nice, but they don't cool your body once it's above 35°C.

Sources

  1. Extreme heat events: How to protect yourself from the health effects of extreme heat, Health Canada. Checked 28 October 2026.
  2. Food allergies, Health Canada. Checked 28 October 2026.
  3. Before you shop: food allergies and allergen labelling, Canadian Food Inspection Agency. Checked 28 October 2026.
  4. Nutrition for Healthy Term Infants: Recommendations from Six to 24 Months, Health Canada. Checked 28 October 2026.
  5. Infant botulism, Health Canada. Checked 28 October 2026.

We summarise official guidance in our own words. Always follow advice from your local authorities.

One less thing to worry about

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