I start out with a few inches of water and put a ~1/2 gallon ice block in the cooler twice a day. When I do this I pour some of the chilled water over the outside of the fermenter to wet the shirt. If I'm diligent about adding the ice block in the morning and evening, the shirt dries out some, but remains wet. Should I start with more water - maybe filling to halfway the height of the fermenter?Is there no water in your swamp cooler? How do you keep the shirt wet?