My suggestion is if this bartender was so rude, and you did not know of the other water foumtains and needed the water right away, you should have asked for the house manager.
I am all for taking those moisy bottle away at the door. Had a woman behind me at Dolly when I saw it constantly squeezing one umtil I turned around and told her to stop, after a few glances back at her.
As far as it being a goddamed bottle of water, well, if you think you are going to be takimg water into the theater or may want some, be prepared to pay for it or ask when you enter where a fountain is located. They have the right to not let things into the building. I ask a lot when I go in where a fountain is. A sip from the fountain does me fine before a show. I also don't think age is a thing. I am in my 50's and have no problem. I climb up and down stairs at theaters all the time, even with a weak knee. Just my random thoughts.
Just give the world Love. - S. Wonder