Lots of 2 liter bottles. My incubator is an old fridge and it has enough bottles of water that it can hold temps for 8 hours. If the power stays off I can fill them up with hot water from the sink and keep the temps up that way. Backup batteries don't last long enough for me to want to spend the money on them. They would be nice if the power is out short term, but in this town if it goes out it's going to be out for a while.
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