Another solid contender in the lightly flavored water category: Hint is mild — but distinctly — flavored, all natural and with no sweeteners added.
I tried two varieties: Strawberry-Kiwi and Cucumber. 13 flavors are currently available in total. I found both versions very good, though obviously different as night and day. The cucumber version is cool and refreshing — perhaps a bit too much cucumber for my tastes, but still quite pleasant. The strawberry and kiwi water was, as expected, considerably sweeter but not cloying. Again, this one was quite refreshing and distinct in its strawberry-ness. (The poor kiwi never stands a chance against the monstrous strawberry.)
Assuming the rest of the line is as tasty, Hint is a nice little diversion from plain water — and certainly feels like a better value than paying for unflavored bottled water.