.. How to get black powder

Well, black powder is usually used in rockets and firecrackers.

Yes, you just played, quite unsuccessfully, with some. ( Go to Toni's backyard. )

There is a dud on Toni's backyard from your heroic attempt. The powder is still inside the rocket.

Maybe you could drill it out.

Use the drill to the rocket (kids, do not try this at home!) and you have some black powder.