Kristen,
I asked the staff at "The Perfect Gift" (the owner, Shirley, is on these boards) to pack a bottle of Jameson Irish Whiskey as part of a Father's Day Gift basket for my DH. It was no problem, and I bet a reasonable amount of beer can be arranged. Depending on your cruise, the first port may be Key West where you can stock up without dragging it aboard the first day with everything else. The basket was delivered to our room the afternoon before we set sail, and it was a great surprise for family (no, the girls didn't get the Jameson, but they enjoyed the snacks and soda, and I loved the large canvas Disney souvenier bag and Mickey Cape Canaveral towel!) Just give the staff a dollar amount and they'll take care of it for you.
Kathy