Do you make a wireless mic that can withstand some water. I work at the Fort Worth Zoo, and we have several wireless mics. One of them is used when the keepers wash the horses, water gets every where. Do you sell any water proof products?
There are "waterproof" cases that fit wireless transmitters. http://www.aquapac.net
For the mic, try using a dynamic headworn mic like the WH20. Not waterproof, but definitely water-resistant.