Some is and some isn't pruni, but the main thing is that in most parts of the country tap water tastes at least as good as bottled (I think he might make an exception for the allegedly-recycled-7-times Thames area water!) and doesn't have to be bottled and shipped.
My kids often buy a small bottle of water if they want a drink when they're out, but we collect the empties as much as poss and they take them out refilled with tap water eg to the gym (if they remember...)