Minding my own business buying sun screen 'cause I'm a burn 'n peel girl, I found that Walgreens (16th Street Moline) also had insulated 24 oz. Polar Bottles on sale for $6.99. I've heard that the insulated bottles help a bit in keeping your water cooler, so I figured I'd try one. I spend a lot more than $7 on far more stupid things.... Don't know if they work. Will try it out tonight if the rain holds off.