There are various ways to make a refrigerator that doesn't use electricity.

Coolgardie safeEdit

A tray on top has water in it, which seeps into bags on the side. When the water evaporates from the heat, it cools what's inside. See Wikipedia:Coolgardie_safe for more details.

Instructions on how to build a cheap more modern version can be found at [1].

See alsoEdit

Cold storage