If you wanted to use an OTC diuretic like Dandelion root, you can do that as well. Use it as on the bottle. No need to get aggressive with it.
Some quick notes for stage:
- if you experience cramping at all, keep a salt shaker or some sodium packets with you, or even a small bag of potato chips to get some sodium in your mouth. That will promote water in your system -cramping comes from electrolyte imbalance. I'd also suggest bring a bottle of Pedialyte with you and sip on that intermingled w/ your water on show day. Also helps keep electrolytes in balance.
I wouldn't expect a big deal, but you never know on show day, and cramping can suck balls if it happens.