Flower Pot Fridge! – YouTube
Zeer pots are pretty rad, but be aware that your mileage may vary: These were developed in Egypt (albeit several millennia past) and rely on evaporation for cooling–just like you and me. Here in Michigan, we’ve had a straight 10 days or so with upper 90s temps and upper 90s humidity (FYI, although those temps are a lil higher than the traditional norm–say “Hey!” to total climate collapse!–the humidity is totally, totally the norm). Subsequently, this kind of “swamp cooler” tech has never caught on here in the pleasant penninsula. Our old-skool simple tech equivalent is the trash- can root cellar.
(props to Mojo for the vid link)