Alcohol stoves use denatured alcohol (mostly ethanol) or HEET (methanol). Denatured alcohol can be found in the paint section of any hardware store; it is ethanol with a small amount of methanol added to make it unsuitable for drinking. HEET and similar products can be found at many gas stations. IMHO, ethanol is more environmentally friendly.

You can also use pure grain alcohol (Everclear) if it is legal in your state, but it's a really expensive option. You can mix it with reconstituted powedered juice drinks for human consumption.

Rubbing alcohol has too much water to work as a fuel. The same is true for most alcoholic beverages.