Keeping food from spoiling is one of my biggest concerns, too. I’ve built up my pantry with lots of shelf-stable jars (home-canned soups, veggies, meats) and dehydrated goods, so the fridge isn’t as critical. For fresh stuff, I freeze water in 2-liter bottles—if power goes out, I move those to the fridge and keep the doors shut tight. It buys me a couple days at least. For warmth, I rely on wool socks, thermal layers, and a big pile of quilts. I’ve also used those clay flowerpot candle heaters in a pinch (supervised, of course), and they actually take the edge off a small room.
One thing folks often forget: a manual can opener. And battery-powered or hand-crank lanterns—