I spent $450 on beer and a couple of mixed drinks, I def. drank more than 5 beers a day. It is more expensive than sneaking some on board, however $500 should have you feeling pretty good, it also depends on when you stop and start drinking each day. If you don't start till after dinner and stop around 1 am you wont spend nearly as much as if you start at noon and finish at 0200. Anyways, have fun and I think it is hard for anyone to give an exact amount to bring.