it is just fertilizer. Sulfur is not necessary but is available at home depot or garden stores. There are many recipes on the net for black powder. Some are very well researched and tested with sources of supplies listed. Lowes, home depot, Walmart,or garden stores each have everything you need. Inexpensive and safe to make your own, or least so I have been told.
If you're at Lowes, look for "Spectracide Stump Remover". If at Menards, look for "Green Lightning Stump Remover". If at Rural King, don't look, 'cause it ain't KNO3.
If I knew how to use the Library of Congress, I'd look for bulletins circulated during the Civil War (by the Confederacy) about how to make a niter bed. Saw one referred to by a guy in Austrailia, but don't remember where. The South ran out of almost everything but gunpowder, never even produced to capacity, and had a surplus of hundreds of tons at war's end. They used cottonwood for charcoal, (which around here is easily found in driftwood piles).
Their whole industry was started from scratch and they didn't intend to waste a single chamberpot.
The moral to the story: They wanted it that bad.
As to a home process, a manure slurry mixed w/wood ash will give off ammonia fumes. That means its turning from ammonia nitrate to potassium nitrate. For a shortcut, fertilizer has three numbers which refer to N, P, & K. Forget the "P" (phosphorus). You only want the nitrogen and potassium, so the middle number should be "0". The last number should be three times the first or thereabouts. If not, anything left over is still useful as fertilizer.
When dissolved in enough hot water, it will recrystalize as it cools. The sharp stuff that looks like broken glass is the saltpeter crystals. They crystalize first, so if stirring with a strainer, they can be gathered while the other salts are still in solution. The other stuff crystalizes into fuzzy globs without the charachteristic broken glass look, which can be put back onto the niter bed.
A second job would make more sense if a guy is trying to stock up. If he's out of work, it would give him some entertainment.
Location: Third bunker on the right,Central Virginia
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Saltpeter can be made from scratch, starting with manure- chicken manure and bat guano are very good. Sulfur can be found in the area of some mineral springs (Like White Sulfur Springs, WV)
Willow charcoal works best. When mixing ingredients, can be quite dangerous. Simple mechaical mixing makes what was known as "meal powder"- good for shooting rocks, lousy for shooting guns. Best powder was mixed with alcohol into slurry, let dry, grate it through window screen- and you had "corned powder". Good for firearms. Uniform mix, grain size.
There are other propellants, but I do not give directions for making explosives on the internet- moral qualm on my part. Arrows? I can make slings and spears- and learned how to knap flint. Ever hear of an atlatl?