Vitamin Water and Life Water both contain 32.5 grams of sugar per bottle, so you might as well hydrate after a workout by drinking a bottle of water and tossing a full sized Snickers (30 grams of sugar) down your throat. But hey, at least that's half a Snickers less than a can of Coke, so really it might as well be water.
There are low calorie versions out there, like Vitamin Water 10, but it still has to appeal to their customer base: people who refuse to drink anything that isn't sweet, even their daily vitamins.
"Man, if only these came in doughnut form."
That means you're trading sugar for artificial sweeteners, and experts say that's a bad idea from multiple angles. Those sweeteners have some possible long-term side effects and might even trick your body into slowing down its metabolism, causing you to actually gain more weight than if you were on the regular stuff. But maybe your particular brand uses stevia, the trendy natural sugar substitute. Well, you should know it might even be more controversial than artificial sweeteners and has been banned in the EU.
Basically, you name a sugar substitute, and we'll name you an organ failure or type of cancer.
Which, coincidentally, is a fun party game at Weight Watchers meetings.