The basics
The Government of Canada recommends 2 litres per person per day as a minimum for drinking, cooking, and basic hygiene during emergencies. For a household of four people, that's at least 24 litres for a 72-hour emergency.
If you have room to store more, aim for 4 litres per person per day to include washing and cleaning. That's 48 litres for the same household.
How to calculate for your household
Multiply the number of people by the litres per day and the number of days:
- Minimum: people × 2 litres × 3 days = total litres
- With extra: people × 4 litres × 3 days = total litres
Examples:
- 2 people: 12–24 litres minimum
- 4 people: 24–48 litres minimum
- 6 people: 36–72 litres minimum
Beyond 72 hours
If you can store it, keep extra water. Extend the same calculation to 7 days (168 hours) or longer if you have the space. A case of bottled water or a large refillable jug takes little room and adds days of security.
What counts as safe water
- Sealed bottled water from the store
- Water you've boiled and cooled (if starting with tap water)
- Water from a refillable jug filled from a safe tap
Keep track of dates
Water doesn't spoil, but containers do. Check sealed bottles for best-before dates once a year and refresh your supply as needed.
Next: Learn how to store water safely and what to do if your supply becomes unsafe.