We've talked about this quite a bit here- whether for travel or power outages- it's essential to have ice chests or thick styro-foam food-shipping boxes on hand, along with cloth snake bags or pillow cases.
Then it depends on whether you have a gas hot water heater, or not- if you have hot water, those chests can be warmed efficiently with a bottle or 2 of hot tap water, & changed about every 8 hours (depending on temperature in your house, but I got thru a 4 day ice storm this way, during which my house got down to 45*).
If you don't have hot water access, use those chemical heat packs they use in shipping snakes. Neither heat source should be allowed to touch the snakes- wrap them as needed inside the ice chests, & allow for a bit of air flow too.
I hate trying to tie/untie cloth bags, so I seal them up first with a strong twist wire (zip ties work but have to be cut off), then folding that over on itself, & wrap tightly with a strong rubber band.
Having all these things AHEAD of time for emergency is key- power outages in winter are no fun. Stay safe!
Of course, if you can manage a home generator, that's the high tech, expensive option.
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