It is Dasani. I got a case of 24 at the BWI last month for that price, about $6.50. They are the little 8 ounce or 12 ounce bottles, not the big ones. One case was perfect for me and my daughter for the week, since we only needed it in the room. The cashier told me that they had recently dropped the price by $10.00 a case (so it used to be $16) and she didn't know if it was a permanent price drop.
Either way, it was convenient, and they were cold already!