Glad to see that most here are providing a drinking fountain, or "bubbler" as any true Milwaukeean would call it. It has always boiled me that some cinemas/theatres are too cheap to even provide that, thinking that if one is thirsty he should buy one of their soft drinks, and that they will thereby force him to do so. Some concession girls have even had the bored look on their faces when I offer to pay for a cup of water, and tell me that all they have is soda (pop) on tap and that I will have to buy one of those. They are too lazy (or instructed?) to go to a sink that is probably in the back room and get some water into a cup. When I then ask for an empty cup that I will pay for to fill it in the men's room, they say that they are not allowed to sell cups for that purpose since it is against the "health code to take such into a restroom," which it is NOT, of course. From then on, any place that did not have a bubbler was off limits as far as I am concerned.
Appeal to the manager you say? Try finding one who is over 18 in a multiplex and has adult attitudes; besides, I am there on my time to enjoy my time, not get into a 'discussion' with a kid who obviously couldn't care less. More than once I have written a multiplex's home office about such situation and copied the local cinema about it, but have never seen a change, and only once received a form letter in response, the 'we're sorry for your disappointment, but we are always improving our sterling quality of award-winning service and look forward to seeing you at many more screenings at the famous blankty-blank cinemas!' type of response. Such tripe and hype I do not need, and never have returned but once to see if any bubbler ever did materialize. It didn't, and I didn't.
P.S. (The taste of tap water here is among the best in the nation, so bottled water, which is now often sold, is not really necessary from that standpoint). Let those who crave a brand name on their drinking water have such and pay for it, but if a cinema wants to be a real money grubber, just make no bubbler available!