hmmm??? changing the water every other day seems excessive to me. Especially when my snakes will hide for days on end. Plus, the days I work, I am gone for like 15 hours, so I dont have the time to tend to my snakes every other day. Thats the beauty of keeping reptiles, you dont have to give them daily attention and they wont even feel unloved.
Besides, I dont think if your reptile drinks water that is 4 or 5 days old, it will say to itself "damn this water tastes like crap, I wish my owner would give me fresh water everyday." But hey, if some of you are that concerned that you feel the need to change the water every other day, then more power to ya!!