by Lizzie Bennett, The Daily Sheeple:
Zeer pots have been used in areas without electricity to cool foods for generations. They are cheap, simple to construct and extend the life of perishable food in hot weather. They are not as convenient as having an electric refrigerator in the kitchen, but it’s definitely worth having a couple ready to go in case of power outages.
They can be as big as you like, just remember they are going to be heavy so if you are making a large one build it where you intend it to stay.
The principle is very simple, they work because of the cooling effects caused by water evaporating.
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