The best kit is the one you can actually find and use. Start with necessities, keep them together, and improve it over several shopping trips.
Start with what you already own
Before buying a premade bag, look through your home for a flashlight, chargers, a manual can opener, basic hygiene supplies, copies of essential documents and a weather-appropriate blanket. Test batteries and check expiry dates. Store everything in a portable bag near an exit rather than scattered across cupboards.
Cover water, food, light and information
Canada's current emergency checklist suggests two litres of stored water per person per day. Ontario's guidance recommends four litres when planning for broader household needs. Add non-perishable foods that your family already eats, a way to open cans, a flashlight, an independent radio and a charged power bank. Build for everyone who lives with you, including pets.
Keep it usable
List emergency contacts on paper, plan where to meet, and refresh consumables at seasonal time changes. A smaller, maintained kit is more helpful than an expensive collection of gadgets nobody knows how to use. Consider needs for medication, infants, mobility and temperature.