I have a small can with holes in the side, similar to HankB's pics over the intake. I build on a SJS. It seemed to hold temp much better w/o the water pan. I think I will forgo it in the future. I had to add a little fuel about halfway through, but otherwise all good. Now if it would just stop snowing.
Hudson Valley, New York: 22.5" Weber OTG, 22.5" Weber WSM, 14.5" Mini WSM.