I’m sure there’s some way you could in theory, but that really seems like a good way to gas yourself out of your own home and/or end up in the hospital from inhaling it or giving yourself a serious chemical burn.

Historically speaking, the government doesn’t like it when citizens have access to perfectly safe plants.

I think most things you can make yourself, if you’re talented enough. Might take a lot of effort though. But afterall, someone made everything in the first place.