Curtis, everyone has their style, but I have NEVER put water in my pan on my WMS and just double wrapped the pan and the Mexian Platter (14 Inch) i set right on top of the water pan. I seem to see more people cooking without water, as it plays with your temperaturess as it gets hot etc. I have NEVER had a bad cook yet, and I'm a fairly new "Newbie".
I cook most my stuff at 225-240 and I leave ALL my vents closed except the top vent, which I open about 1/4 to 1/2 and use a DigiQ Guru Temp controller. It keeps in "on the money", with not even one degree variation. I've been very happy with it, and Customer Service.
Good Luck,