How could alcohol be made into a powder?
Cyclodextrins, which comprise a class of cyclic carbohydrates, use their properties of being hydrophobic within their ring(s), yet hydrophilic outside. Alcohol can be put inside these rings. Then, the entire molecule is still capable of dissolving in water, releasing the encapsulated alcohol molecules. (src)

This popsci link has one way of making edible powdered alcohol. A nice casual step-by-step tutorial, actually...

Still you want to maintain a balance between maximizing alcohol (or do you?) and having the powder "feeling wet" due to high absorption of alcohol.

Also this may be a relevant Wikipedia article.