^ Oh, I am not worried about calories. I am, however, worried about the sugar, in the sense that everything seems to be so sweet these days, it is hard to find "normal" stuff. And water is just... well... water, why make it more sweet?
But anyway, from what I understand this is not the case here.
Now that you mention coloring the water, I think there was a company here trying to promote colored bottled water for children but I haven't seen anyone actually carrying such a bottle.
It's not about making the water "sweet" so much as it is about giving the water different flavors, like Kool-Aid. Plain old water can be boring sometimes. I found it easier to drink more water if it was flavored, and I therefore stayed more hydrated.