i hate to tell you this, brian, but cold water ALSO stimulates the body to pee:In a wetsuit, if nature calls, well.....
Thank God that cold water doesn't stimulate bladder function like warm water.
cold water ---> vasoconstriction in the periphery (ie, your skin)
vasoconstriction---> increases blood flow to internal organs (the body tries to keep "vital organs" alive by "sacrificing" blood flow to skin)
increased blood flow----> increased KIDNEY blood flow---> increased production of urine
so there's gonna be plenty of pee. now, if you've got great bladder capacity, you're GOLDEN, so to speak....