Best way to save money on alcohol at weddings?

My best friend is getting married and has solicited my advice about how to deal with the booze situation. She and her fiance don’t have a lot of $ to spend. She works for a nonprofit, he is currently unemployed (they just moved and he’s still looking) and their parents do not have a lot to give them as far as I know. I think drink tickets are too tacky. What are some good ways to save money, provide enough complimentary booze to keep people happy, without breaking the bank? I am almost positive that the place they are getting married does not allow any outside alcohol, but I am waiting on info about a corkage fee if they do allow it…..