Does Diet Coke (or coffee, tea, Pepsi) ever turn to H2O in the body?

[Dennis S]

I know caffeine is a diuretic, which is a strike against tea, coffee, and cola. If they don't eventually turn to H20 so it can react with minerals and other substances properly, that's a double whammy, I think. I may consider giving them up if they don't become H20, or at least start drinking much more water.