[adamanteus]

Perhaps just a thermostatically controlled heat mat placed under the bin would suffice.

I think untreated wood would soon fail, if it's full of water all the time. Even good hard wood won't stand up to permanent immersion for so long. I know glass and ceramic water bowls aren't the most natural looking thing, but they are extremely practical.

So, Donna, would you not be willing to buy whole fish such as trout? I guess they are farmed (at least sometimes) but I don't know under what circumstances they are kept and killed. I can understand that this would be something of a dilemma for a vegetarian. Please remember also, that it is important to vary your snake's diet as much as possible, so you're looking for more than one acceptable food source.