I work in a dialysis unit here in Winterpeg and over the years I have done much water testing and RO maintenance. Two things to remember about treated water are that it is extremely aggressive (Eric already said this) and it WILL grow stuff. It will leach chemicals from most types of plastic and will actually damage PVC and ABS. It will eat copper. This is because of the 105 degree angle between the hydrogens, this makes the molecule like a bar magnet and very attractive to anything with an unsatisfied bond. In air it picks up carbon dioxide very quickly and becomes acidic as well. It will grab anything it can to neutralize the magnet. Why anyone would want to drink this stuff I don't know! (Calcium from bones, magnesium and potasium from the blood)
The other thing to remember is that without anything to suppress the proliferation of bacterial and algal growth the water will start growing stuff right away. We sterilize our water treatment systems every six months not because we have nothing better to do but because they need it. I could show you water lines that are bright green with algae or bright pink with flourescent bateria. People died in Walkerton Ontario because the chlorine sytem failed. The dirtiest place in most peoples homes is not the toilet or the kitchen sink but the oft used water bottle.
Yada, yada, yada. Having said that, I really appreciate Eric sharing his knowledge with us. I remember working in a TV station years ago and being told UNDER NO CIRCUSTANCES use rubbing alcohol to clean anything.
Don