Visualize camping out … inside the house.
Ski jackets and gloves.
Fill the tub with water ( with a plastic liner ) for an emergency water supply. Ration that water. No baths. Minimal flushing.
Be mentally prepared to do stuff in daytime when there is natural light. Be mentally prepared to go to bed early, when the sun goes down, to conserve candles and lanterns.
Candles, by the way, (and any open flame) are EXTREMELY dangerous. If one tips over, the house could burn down. Besides the soot from the candle dirties up the ceiling.
Instead of candles, use lanterns with batteries. Cabella’s and Sportsmen sell all kinds of lanterns. We found some flashlights that have a folding tripod on the bottom and a tilting head on top, with a switch that has settings for full, partial, or off.
Have rechargeable batteries available and keep them charged. Use LED flashlights and lanterns instead of lights with bulbs as LED’s only use 5% of the power of incandescent bulbs, and the batteries will last 20 times longer. The batteries will lose their charge eventually, so they have to be checked monthly and recharged. LED “bulbs” last almost forever … like 20 years and you don’t have to be concerned about their burning out.
Buy some MRE entrees. MRE’s actually taste pretty good and can be eaten cold. Buy some Tabasco sauce for those who require flavor “enhancement”.
Some tarps in case a window breaks or there’s a roof leak.
Have a deck of playing cards and some board games … Monopoly, etc… Learn to play “Battleship” on paper.