We drink lots of WATER! We bring enough bottled water for everyone to have 5-6 a day. I bring packets of mix-ins and we use the water to make our cocktails too 🙂 Costco has by far the best deal with a 40-pack running $3.37.
We also really like the pre-mixed TGI Fridays brand of blended drinks. Particularly the Pina Colada and Mudslide.
We provide water as part of the price that everyone pays but then each person brings anything else they want to drink. They bring a personal cooler and leave it in their room. This includes pop, beer and any other alcohol or juice.