Since you are posting this in the flintlock section, I am guessing you are going to be working with a flintlock?
Long answer short, the fake stuff won't work in a flinter. Reason is it requires a hotter spark than the priming charge can provide. It is for percussion guns.
So, back to the real stuff.
Also, there are several businesses that will ship minimal amounts of black powder, so local availability is not really an issue.
Welcome to the TMA. It's a good place to hang your hat.
John