I would suggest
-a water refill station/tap/something.
-In an outhouse/blue rocket/washrooms
-First Aid Kit/Eye wash equipment
-A phone (emerg only)
-A good paper grid map of playing field with paths and features marked
I will 2nd bbs for sale, and the NO PAINT! (The stuff doesn't come off once its dryed...which it usually is by the end of the game and I spot it when getting changed.grrrr.)