Clay flower pot base (wrapped in aluminum foil) sitting inside the foil wrapped water bowl with more foil on top that gets thrown away after cooking.
I tried water, for chicken then ribs, and never again. Temp control is fine without water.
I'm still fairly new at this, but here's a few tips I'd give to anyone just starting.
Fill the charcoal ring with your choice of charcoal. You'll be looking at an 10-12 hour smoke for the pork butt and don't wanna run out.
Use less lit charcoal than you think. Even now, I have to force myself to stop at 12-15 lit briquets.
Wait 30 minutes after making a damper adjustment before gauging your temp reading. A little adjustment goes a long way.
The temps will rise-n-fall, which is kinda cool watching on the Maverick. Let it do it's thing.
If you wanna kick it up a notch, toss a disposable aluminum foil pan full of store bought baked beans under the pork butt for the final couple of hours. You'll be glad you did.
Most importantly, have fun.