http://www.ratnutrition.com/water.html
"Avoid tap water! It's always best to give your rats drinking or distilled water. Sound expensive? It's not! Try buying the large containers of water with a spicket from your local supermarket. The water is cheap, it's easy to refill drinking bottles with it, and it lasts a long time.

Why is tap water so awful? Check back soon for links to some great articles about this very subject. A great deal is known about the harmful affects of chlorine and fluoride on rats, since rats are the ones experimented on to discover more about ourselves."

So since i'm convinced now, and use only tap water, that has bleach added to it, are these people misinformed? Or has there obsession with rats lent them the knowledge that tap water is BAD. I have to admit, it's probably no worse than water from ponds or running sources of water out in the wild.