I use Nuun tablets with room temp. water and don't drink any until about 45 minutes into the ride. I start with a 12oz. glass of water before I leave for my ride. I am a caffeine junkie so I get the kind with caffeine and I don't notice any fizz at all. I do notice that the fatigue level is much better with Nuun as opposed to just plain water . I only ride about 35-40 miles a week so not too hard core . Sometimes I ride a bit more , but usually just keep it as a light ride . I do ride hills a lot so that gets me thirsty and I always finish the bottle of water/Nuun mix. Joe