I purchased one of those kits some time ago. Rather than paying hazmat shipping charges, the vendor sends you the formula for making your own "firewater" powder.

As I recollect (I'm not handy to the instructions) it was half potassium permanganate and half processed sugar.

I subsequently read a warning on another site that this mixture isn't perfectly stable, and may spontaneously ignite.

I have no experience either way.

-- Bear