I know that the contaminates in tap water are bad for my snakes (chlorine, fluoride). Which is why I used to buy spring water from the grocery store. Although it's not expensive to refill 1 gal containers, I've lately been using the filtered water from our Pur and leaving it out for a few days to let any chlorine evaporate. Is this acceptable for my corns? We have city provided water, not well water.