docc- I think $8 -12 for (shorty) beer. You can get *free* water to fill your bottle. I went to first day of first Moto GP and they took a 5 year old's PP&J. The kid was on special diet. True.
You can bring anything into Barber: booze, food, contraband. I've camped there 3 times. I think they were doing drunken motorcycle jousting one night -at least I was told, I have no memory of it.