I think Crystal Light counts as water. In fact, according to the article
Fluid Fundamentals that appeared in a recent issue of Cooking Light, just about any fluid you consume counts towards your total water intake for the day. This includes sweetened beverages (with real or artificial sweetener), juices, milk, tea, coffee (even caffeinated), and alcohol. Also, all food has some amount of water--even bread--and that water counts too.
I've read other articles that say the same thing, the Cooking Light article is just the easiest to link to.