I'm pretty sure the Woody Pet is made out of pine. I KNOW the very similar product, Equine Fresh, is made out of pine. The processing supposedly removes the aromatic oils or whatever it is, but I still don't think I'd put my snakes on it.

I agree that an easier solution would be to do something with the water bowl. If the problem isn't so much tipping it, but he gets in it and splashes, maybe if you just didn't fill it so full?