The label emphasizes vitamin and water. But it turns out the beverage is more "sugar water" than vitamin water. So what it chiefly is, is "sugar water." The sugar content is probably a lot more than you'd success, and the label has cleverly labeled the bottle to have more than one serving in the bottle so they can spin the calorie count down.
Even Coca-Cola's own attorneys publicly admit Vitamin Water is not a healthy beverage.