all mine have large containers or plastic tubs for a water dish this allowing me not to have to re-fill every couple days but every week or 2, unless obviously they poo or pee in there water, I use tap water and have never had a problem. I also gave breeders choice a try but didn't like it due to it being ugly, a pain to clean and also had a bad problem with mites on my pythons and didn't get rid of the mites till I got rid of the breeders choice, that and bathing all snakes in contact with it and also bleaching there cages out. have never had problem with mites since then.