A half-full freezer will keep food frozen for 1 day. If power will be coming back on soon, you can make the food last longer by keeping the door shut as much as possible. Ice can keep the freezer cold. If power will be off for a longer time period, take food to friends' or neighbours' freezers if you can. If in doubt, throw it out.
Ice can keep food on the refrigerator shelves cooler.
Discard any thawed food that has risen to room temperature and remained there for 2 hours or more. Discard any food with a strange colour or odor immediately. Or, contact your local public health unit.