The Diet V8 Splash is fruit-flavored. I've only tried the Berry Blend, but it is good, and at 3g a serving, not too bad for a "juice"..

Crystal Light is good, I love the grapefruit flavor! No carbs there, or just a trace.

I'm finding a lot of the flavored waters and drinks a bit too sweet for my taste anymore, so I usually dilute them quite a bit.