Ultima.
http://ultimareplenisher.com/

Used the raspberry flavor for years until they came out with the grape flavor late last year. I have a glass every morning with breakfast (and one in the evening with dinner) whether I run or bike or even take the day off.

In the summer months, anything 60 minutes or over, bike or run, the Ultima is in my bottle. I've tried them all. The Ultima is simply the best- tasting and for hydration.

Whole Foods sells the stuff. You can buy it in small packets to check it out. Again, I wouldn't even consider another fluid replacement. Highest recommendation.