For every power tool you own, have a hand tool able to back it up. No power means no plug in power tools/battery recharge - unless you have a power inverter for your car.

Tarps, tarps and more tarps. Furring strips, nails, staples, hammer, ladder.

Be ready to lose all the food in the fridge and freezer. To extend the cold - freeze bottles of water. Fill the freezer with them and then DON'T OPEN unless you absolutely have too. Same same the fridge.

Extra propane tanks for the grill, which you may be cooking on.

Mosquito nets, it may be cooler to sleep outdoors if no power and no AC.

Have cash on hand, ATMs/credit card machines may be down.

Beware of fly by night repair guys. If the person is not local, pass.