Does anyone do this? Basically (if I understand properly) you put your fermenter in a larger bucket of cool water with a wet t-shirt over it and the evaporation of the water from the shirt also cools the fermenter and, by association, the wort. I was thinking of trying this with a Festa Brew Czech Pilsner to get it to a good 12 degrees C or so in a 18-20 degree C room.