Now this is for me what science is all about. Through a series of links i found myself on this post on GRYNX that delves into the important stuff, near and dear to my heart. To quote the post:

While drinking certain dark beers in the sun, I came to think about how to keep the beer cold until I finished it.
Normally this isn’t a big problem as I usually finish them before they get warm, but on really hot days this can be a problem. Having some hardware lying around in my apartment, I decided to build something that could keep the beer cool.

A full and detailed description of how to build the system is included in the post