Walgreens has Dasani bottled water 24/pack for 2.99 this week. In addition, for every 15 dollars spent you get 3,000 points.
The ad states 2 case limit except in New Mexico, no limit. Some stores will let you buy more then the 2 cases anyway. The store I was at this morning had several pallets full of the water.
If you are in a state where walmart matches grocery prices, they will price match if you don't care about the points.
On the front page of their ad: