I like to fill the base of my bong half way with water and then the neck with ice. If I want to get ripped I'll hold the flame to the weed until it is burned away. It usually takes a full lung full to kill the bowl. I hold it in for about 3 seconds and exhale out my nose without lifting my mouth from the bong. Then I clear it.

If I'm just kicking back and relaxing I take small bong rips off the corner of the bowl. Rotate, take another, and repeat. That way I get a good dozen hits off it, and it never gets gross cause every hit is green.