How can purify drinking water well?
The quick answer is yes, however, it might be hard to convince some people to drink it because of the word "recycled". But factories have been able to recycle, cleanse, and purify water that can be consumed by people. Did you know that some water purifying factories can clean water SO well that they would have to put stuff back in the water for it to be drinkable? ~Apple Juice
Most bleaches contain oxygen; drinking water contains oxygen and hydrogen. However, the element probably meant is chlorine, which is in the most common kind of household bleach (so is oxygen) and in polyvinylchloride, the material that makes PVC pipes. It's not really "used in" drinking water, though small quantities of chlorine compounds may be added to drinking water to "purify" it (really to sterilize it; chlorine is pretty toxic to microorganisms).