@Tfmonkey You've said this error twice -- sodium nitrate is not what you need for black powder. Potassium nitrate is what you need. And it is what you get from piss.
The only ingredient I'm stocking is sulfur, because it's more difficult to come by naturally.
Charcoal is easy to make. Here are snapshots from my personal notes.
First, the ingredients:
@Tfmonkey And here is the recipe.
PSA --
Black powder is NOT A SUBSTITUTE for modern gunpowder (gunpowder is also known as "smokeless powder") used in modern weapons.
This is specifically for black powder weapons (legal for felons to own). I also have a mold, ladle, and lead for making my own lead. I recommend using balls. Grab at least 1 box of lead at the correct size (currently for sale), to compare.
Black powder can also be used creatively for other fires and explosives.
@TenaciousWolf It does have a "mad scientist" vibe, I think.