Speaking of kimchee, I fell in love with the stuff, when I lived in Hawaii.
Back, (well, kinda) to the subject at hand, the large water container is a great idea for cooling. Here, in Arizona, since our RH is low most of the time, we can gain 10 to 15 degrees, with a large bucket, t-shirt, fan and a small fountain pump. This system works best, if you use AC in your house, and not a swamp cooler, because basically, you are going to be swamp cooling your fermenter.
Carboy in a large bucket, =5 degrees, or so.
T-shirt gains another 5 degrees.
Wet t-shirt, and fan will give you another 5 degrees, maybe more.
Put the pump in the bucket, with your carboy in it. Wrap the t-shirt around the carboy. Rig a syphon hose from the pump, into a loop around the neck of the t-shirt, with holes along the part around the neck. (You only need a SMALL pump, nothing more than 50 gallons per hour, or so. All you need to do is keep the shirt wet.) Now, blow the fan on the wet carboy.