davefan13 basically has it right. The vast majority of snakes--including watersnakes--cannot handle that type of wetness, moisture, humidity. They develop skin blisters that will eventually kill them.
The Acrochordus in my signature are fully aquatic--they live in the water 100% of the time and don't need a basking area. But they are not easy to keep and won't work in a vivarium,etc.
The Homalopsinae snakes are what You would be looking for. Even though many are a nuisance in their native lands--they are not often imported. They are eaten by the locals and their skins used for the skin trade or used for crocodile food on croc farms--they are that abundant!
In a little over 2yrs of searching, I have managed to acquire 9 Homalopsis bucatta, 2 Enhydris chinensis, and passed on a group of Enhydris plumbea because the price was just too high. These snakes are purchased by importers for about $4 each. I'm not going to pay $60 each or more to a gouger (sp?).
Anyway, if You can keep the humidity/moisture down--you might be able to get something to work. Otherwise, you are just asking for trouble.
HTH
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