We leave it out at all times here too. All of us use tap water (all being my DH, myself and our two furbabies) however, we double filter it. First we filter thru Pur connected to our faucet and then we run it through Brita. Just gives me a better feeling about it
While I may joke about this, I did have Zoey turn her nose up to her water over a couple of days when DH just gave her straight tap water upstairs. So there may be method behind my madness
