Preparing for a heatwave
What matters most in a heatwave, what official guidance in Canada says, and long-life food that suits it.
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 water | 18 L |
| Food energy | 13,500 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.
| Food | Typical allergens | Typically suitable for |
|---|---|---|
| Canned chili | varies by recipe | check the label |
| Canned soup | varies by recipe | vegetarian |
| Baked beans | none of the main allergens in its main ingredient | vegan |
| Microwave rice pouch 250g | none of the main allergens in its main ingredient | vegan |
| Canned tuna | fish | check the label |
| Crackers | cereals containing gluten | vegan |
| Peanut butter | peanuts | vegan, gluten free |
| Dried fruit and nuts | tree nuts | vegan, gluten free |
| Granola bars | varies by recipe | vegetarian |
| Canned fruit | none of the main allergens in its main ingredient | vegan, 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
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
- Extreme heat events: How to protect yourself from the health effects of extreme heat, Health Canada. Checked 28 October 2026.
- Food allergies, Health Canada. Checked 28 October 2026.
- Before you shop: food allergies and allergen labelling, Canadian Food Inspection Agency. Checked 28 October 2026.
- Nutrition for Healthy Term Infants: Recommendations from Six to 24 Months, Health Canada. Checked 28 October 2026.
- Infant botulism, Health Canada. Checked 28 October 2026.
We summarise official guidance in our own words. Always follow advice from your local authorities.


