What's the "mixture" of the poweder in bottle rockets? Sorry I'm not using the right word.

I mean, what goes into them? It's KNO3 and some form of charcoal, that's all I know.

Sorry if you can't understand this, I'm new to all of this.

Commercial companies use their own compositions.
Usually very close to blackpowder, or whistle mix.

What's the mix for these?

Their mix?

Blackpowder and whistle mix ... doesn't take a genius to find out how to make either.