[Yo-Yo]

Boric Acid (How to use boric acid if you're a prepper or survivalist)

Dispose of the bodies of those pesky FBI types when they come sniffing around your cabin...

[dljordan]

“Dispose of the bodies of those pesky FBI types when they come sniffing around your cabin...”

That would be lime.

[unlearner]

You’re thinking about hydrofluoric acid, like Walter White used in Breaking Bad.

But lye from wood ashes can dissolve bodies when using high temperatures (e.g. 300 degrees F).

Preppers would typically make lye in order to make soap by combining it with fat.

But lye might come in handy to dissolve animal carcasses, Revenuers, and pesky FIB agents, in an apocalyptic scenario.