EU tells the public to hold 72 hours of emergency supplies
reuters.com
Good advice for Canadians too.
Items important to have to survive 72 hours in a crisis: food and water to a flashlight, power bank, radio, cash and medication.
I applied to volunteer with Ontario Corps and have gone through their online training modules. Basically it is also the same recommendation: have whatever supply you need in order for you, your family and pets to survive for 72 hours without help.
What Ontario Corps suggest to have in your emergency survival kit: Food (and can opener if required), water, medications and first aid kit, flash lights and batteries, candles and matches, radio, hand sanitizer, spare car key, garbage and ziplock bags (to keep things dry), whistle, cash.
More suggestions from Ontario Corps: Keep important papers (such as passports, marriage certificate, id, insurance, will etc) together so you can grab them quickly if you need to evacuate. Have a family emergency plan (what to do during emergency, contacts, where to meet when separated etc). All family members (including older children) should learn where and how to shut off utilities (gas, water, electricity etc) in your home.