It's not available on the East coast yet except for Florida. Since I happen to be in Florida at the moment, I found it at Publix.
It's non carbonated water without any sodium or artificial sweeterners and a 'twist' of juice. Less than 10 calories. I don't like anything strong tasting so the flavoring is just right for me. Here is the link so you can see if they have it in your area.
http://www.drinktwist.com/