You should say that "most" rubbing alcohols are 30% water. Not all of them are, even ones readily available at drug stores, grocery stores, etc. You can find, but you have to look, ones that are 96% isopropanol. The isopropyl alcohol available in hardware stores is 96% or higher but you have to read the labels.

Pure ethanol, 95% or 180 proof, is readily available at liquor stores, especially ones near colleges. It called Everclear. But you probably don't want to use that since it's rather expensive on a per gallon basis