Could you convince them that it is only water in your camel pack? You could fit a rather large mixed drink in one of those. And I know the feeling. Went and watched my 9 year old nieces softball game over the weekend. Longest 4 innings of my life. Hell one girl even hit 9 different batters in two innings.
Having to sit between my s-i-l blab to one of my wife's classmates about facebook, blah, blah, blah. I don't think she shut up the entire game. That's one advantage of having hearing aids. I can shut them off and there like ear plugs. My s-i-l will drive you insane in about 2 seconds.
Then watching the pitcher hit the backstop about 6' from the ground and 5' out of the batter's box. That or bowling the pitch. I will have to say that the fielding has improved tremendously. There were several nice throws and catches at first base to get the runner out.
Boy do I know your pain. You may wish to consider a good CC rig for the flask. If you OC the cops may get called on a MWF. And we all know how that turns out.
It is easy enough to get away with a flask. Just keep it fairly hidden and get up to take a walk to "stretch the legs". There were a few times I'd carry my small flask into a bar and drink from that before ever paying for drinks.