If you have any way to heat water(gas stove, etc) then you can always use hot water bottles IF the temps are so low that you're worried over the snakes.
Also, if you did have a way to heat them, cornbags are awesome. I heat them up in the winter for myself and they stay warm a long time and you just reheat them when they cool.
Both of those rely on some sort of heating though.
If you fill the freezer, and don't open it, it should be good for a really long time.
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