When creating an earthquake kit, pack three days worth of food and drinkable water for each member in your family. Non perishable food such as tinned food is ideal. Three litres per person per day is the recommended amount of drinking water, which can be held in a water bladder or plastic bottles. Also include cooking appliances and a burner to cook your food or boil water.
Assemble your kit together in something accessible that you can grab at a moment's notice. A backpack or waterproof container are good ways to keep everything together.