Use downtime to bake healthy goods and get individual bread loaves and freeze them for future use when there is a power outage.
BBQ pits or camp stoves are invaluable if you are without electricity for anything from several hours to weeks. Store charcoal in a waterproof plastic bin. Keep matches and lighters in separate plastic containers. If your BBQ or camp stove uses propane, make sure the propane tank is full and that you have a spare tank.
Freeze water in large milk cartons, they stay cold longer than ice and will keep your fridge cooler than in your ice chest.
Have items such as canned food and meats, fruits and vegetables, high-protein foods (peanut butter), a non-electric can opener, and bottled water (at least 3 gallons of water per person) on hand.