hmm its mostly reason G, tap water and bottled water is more or less the same thing, treated, with things in them to kill germs (chlorine), and stripped of natural minerals... a lot of bottled water is treated as well, say oxygenated lol... mineral water is fundamentally different, its water coming from natural springs and many times it has a distinct taste depending on where its from, and is full of - uh - minerals (magnesium, calcium, sodium etc), and its not put in there by the companies, its already in the water
Your points differentiate between water that comes out of taps and water that is transported in bottles, as against treated and untreated water
donno how much of 1/3 bottled water is mineral, dont really think it makes much of a difference