That's a cheap little six-pack cooler. The 4 .7L bottles laying on their sides all but filled it. I couldn't put a fifth one on top of them and still close it.

I may pick up one of those styrofoam "disposable" coolers in the future, and see how it does. For now, I'll just be checking periodically to see how the heat affects the water.

I figure warm, slightly plasticky-tasting water is still better than NO water. Especially in SoCal.