I should stop watching this show,, but I'm hooked. But I have learned quite a few things, some I already knew but got educated to a new level.
If one of these folks says, "People say I'm crazy. I don't think I'm crazy.", yeah, they're not in the same reality as most of us.
You can use the flash unit a one-use camera to make an excellent personal tazer and theft prevention device.
You can make sodium hypochlorite (liquid bleach) and chlorine gas from salt water.
One prepper raises his own fish in a tank. He floats a hydroponic garden in the tank, the fish waste feeds the plants (knew that). By-product of the tank is algae. The algae can be harvested to make bio-diesel fuel (knew that, but didn't think it was worth the effort. Still don't unless you have a huge tank). A by-product of the bio-diesel production is glycerin, which can be used to make soap (didn't know that).
Being on this show somehow gives the preppers access to lots of tannerite so they can blow up lots of stuff.