I know the brand you are talking about. It is my LAST choice and, usually, if that is all that is available, then I will just will stay thirsty. I find that brand actually makes me thirstier. It has a "thick" mouth feel. Plus, they say that they add the minerals for a "pure, fresh taste." Indicating that they need to add something to make it taste pure. Because it isn't. Probably bottled tap water with all kinds of scary stuff in it, that they have to add minerals to just to disguise the taste. I could be totally wrong, that's just my current perspective.
I guess it's still better than a soft drink, though.
I believe that's the only water you can get to drink if you are flying Delta airlines.