[foobarian]

> making your own fuel (without sufficient expertise), as more than 'a little risky'

It seems like just the classic smoke bomb recipe with KNO3 and sugar. I would be comfortable preparing this even indoors, let alone outside.

[SoftTalker]

My friends and I made far riskier stuff as teens based on our high school chemistry knowledge. It was fun but in retrospect not particularly safe.