We were wondering. We use RO water for all of the tarantulas and the snakes, but we buy it at the store and haul it home and are forever running out of it. I wanted to know what kind of water does everyone on the boards use for their herps. Untreated tap water? Treated tap water (if so with what)? Bottled water? We were thinking about maybe getting one of those filters that you can attach to your faucet. Opinions, ideas, anyone?