Here's a link to their nutrition info on a review webpage:
http://www.bevnet.com/reviews/fuze/facts.asp
There are some with mad carbs, but there are also some that either don't have any or have very few.
Here is their website. With some digging, I found the nutrition info. Under product at the top, choose the type of drink and then you have to click on the individual bottle for info. Looks like the Oolong doesn't have any carbs, neither does Diet Green or Diet White. I didn't look at any other drinks.
HTH!