So, the purest alcohol that you can commonly buy, as a civilian, in the US, is most likely . . . the infamous Everclear, at 190 proof, (95 percent alcohol by volume) the highest alcohol concentration that you can get from distillation. I think, also, that Everclear is illegal in, like, 27 states I made soap for 5 years just a few blocks from where the infamous Everclear comes from . . . Everclear is EXPENSIVE, because the .gov classifies it as an alcoholic beverage, and buries it beneath a heap of taxes. Enter the magical word, DENATURED This means that you, in some, approved manner, have the alcohol purposefully 'contaminated' such that it is no longer drinkable (supposedly). Did you know that you are allowed to have your alcohol denatured with LAVENDER OIL ?? Once the alcohol is denatured, by an 'appoved' supplier, it is no longer taxed as liquor, and becomes CHEAP. A drum of denatured alcohol is no longer EXPENSIVE, but it is a potential fire hazard if you store it indoors. Good suppliers, you ask ? I'll pause here with a riddle: Has anyone here tried S**k**k**y Vodka ? Yes, so refined. (A good term, actually.) Do you know where it comes from and how it is made ? . . .