Drinking on the water is extremely serious; because of the sun, movement of the boat, and other aspects 1 drink on the water is equivalent to 3 on land. I'll never forget what our boating safety guy (retired Captain in the Coast Guard) taught us; when they have to drag the bottom for a missing person they almost always find him with his zipper down (stands to take a leak and falls in but he and/or his buddy are too drunk to save him; he told the story of one fisherman who didn't report his buddy missing until the next morning! He went home, etc. and then reported it).

We don't have the nasty Didymo yet up here, hope we don't get it: http://www.tva.gov/river/neighbors/aug05/algae.htm