Zeer (Clay Pot Evaporative) Fridges for off grid food preservation
Build an evaporative refrigerator - no moving parts, no electricity | Rebuilding Civilization
Some pdfs are available below. If it doesn't show them, put "zeer" in the search & it will come up. This site has some other interesting pdfs too, but focused on Africa & many of the issues that they face.
My question is, have you used these? What foods have you used them for?