If we're including flavored waters in this discussion, then chalk one up for :-: Propel :-: . It is sooooooooo much better than any of the other flavored waters out there!
If we are only talking about water-flavored water, then I will drink Fiji if I am splurging, Dasani if I am not, but tap water most frequently. My understanding is that bottled water contains no flouride, so I drink tap for that reason.
Vos is good too, but makes Fiji look like a bargain!