The water in your pan has nothing to do with keeping the meat moist.  It is only there as a thermal buffer/sink to help control the temp.  Since boiling water is putting off 200+* vapor, it helps keep the temp stable.  It also helps to keep the temp from swinging as much when you add fuel or open the door.  
There is a thread somewhere about doing your pan this way. I'll try to find it and post it or bump it back up. It is a variation of what is known as the "Piedmont Method" where you put two pans together leaving a void between them. I haven't used water in my pan now for about 2 months and I love it. No more nasty water to dispose of and the foil just goes in the trash and no clean up at all
		
	
	
		
			
		
		
	
				
			There is a thread somewhere about doing your pan this way. I'll try to find it and post it or bump it back up. It is a variation of what is known as the "Piedmont Method" where you put two pans together leaving a void between them. I haven't used water in my pan now for about 2 months and I love it. No more nasty water to dispose of and the foil just goes in the trash and no clean up at all
				
		
										