Assuming you're hard and fat is not the problem, wine will help dry you out. It's not like taking a diuretic pill as some do but it does help tighten you up a bit if you sip it before going on stage. Just a thought, if not there's always diuretics over the counter but beware of the potassium depletion so if you go that route try to get the ones that say "potassium sparing".