The idea that someone could buy a big one gallon jug of mace to refill their little keychain pepper spray is quite frankly terrifying lol there's no way that could end well
Edit: according to Google you CAN actually buy a big one gallon jug of pepper spray, but only the kind designed for wildlife... That still seems wildly irresponsible lol
And the government will pay him for his emotional distress because his unlawful use of unlawful unapproved spray has somehow caused him emotional harm.
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.
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.
Unless it was for a Bear 🐻🐨.... depending on the bear and your personal fitness you may be better off not running out. But mostly always it's better to run out of a Bear's way.