Tap water all the way. The taps used to be everywhere outside too, for watering greens. Nowadays they have those special jet things in the ground. Back then, wherever you were you could find the tap in 100m and refresh yourself with clean water. The terminals in marinas - all open taps. They even had power sockets open. We used to hold parties and jams that way. Nowadays everything is metered, accounted, networked and shit.
We have a 3 mile long river as a water supply. It originates in the mountains, it is already clean, filtered and full of minerals. Its source is 5 miles away from the geographical city center. I don't see why our tap water shouldn't be dirt cheap and clean. Which it actually is. Plus a 500m leg is still carried through Roman aqueduct. Beat that, Nestle.
It was really a hassle for me to think about bottled water when in places with unsafe tap water. I'm just not used to thinking about availability of water.