I just saw this article today on SHTFPLan.com, about refrigeration. There’s an embedded video from youtube, it’s simple, taking two terra cotta pots one inside another, with sand between them, with a damp towel over them, and can be used for keeping items cool (The video guy got down to the high 40’s, on a 92º day). Maybe worth a view.
Thanks, Got clay pots, I need some sand, weed, and some beer. The streams are real cold always. Then we party like it’s 1999!