Can I bring a water bottle?

I wouldn't

I took a water bottle when I went to John Waters. Security/Ticketmaster's at the entrance saw it in my bag and said nothing.

Youre not supposed to and they check your bags. Depend on how nice the guard is at that moment ;)

I did to Tom Morello . I even brought a can of diet dew.

May need to buy one inside. Go ahead, live a little.