Lava rock? Sounds like a better idea than sand. I guess I am out the door for Lava Rock......No more water for me. I had a hard time smking my first chicken with a water in the pan. No I see why. Good info here and when I smke my turkey this weekend I am using no water.
Never had any issues with water unless it was quite cold outside. Only problem is refilling it when needed. Lava rock is good, just remember to cover it also with foil as you would the sand.