pour your alcohol in a jar with a lid. (this can also be done in its container but its easier to see the layers in clear glass). pour in some salt and shake the shit out of it for a few minutes. keep pouring in salt and shaking until no more salt will dissolve and let it sit until the heavier salt water solution settles to the bottom. then you just pour off your top alcohol layer and it should be over 90% pure at this point. i usually just buy it at 90% but last night they were out and only had 70% and it burns like shit in my alcohol lamp so this trick comes in handy sometimes.