I've been watching a show on Netflix called "Jericho". In one episode, they used fertilizer and water to make ice (needed to bring someone's fever down). A little research verified that it is indeed possible.

But aside from the show's medical reason, I wonder in a post-shtf scenario, would ice really be that useful? Other food preservation methods such as drying and canning seem more practical... But the whole ice making process seemed pretty low-effort, so maybe worth considering? Maybe as a "moral booster" for a special treat once in a while, like iced tea or something? What do you all think?

Of course, this would all depend on whether or not you have the extra fertilizer laying around unused... Maybe it's better just used on the garden?