Prost for beer, zum Wohl for wine. Zur Wolle is "to wool".
If you can distingish the difference in a social situation you don't need to ask the question ...
Bier and Schnaps - Prost
Anything else - zum Voll (with emphasis on the T before the z - please practice your spitting)
= Berlin chav rules.
Hope that helps if you are ever in that position - guessing other local variations will also take place.