while it sounds like a good idea to hit your vapor through a water pipe, no water and minimal ice is your best bet thru a bong.
"Many people are surprised to learn that I use no water in my bong when vaporizing. According to a marijuana water-pipe and vaporizer study done by the Multidisciplinary Association for Psychedelic Studies (MAPS) and the National Organization for the Reform of Marijuana Laws (NORML), water tends to absorb THC more readily than it absorbs noxious tars. At first, I didn't believe it either, but I must say, removing the water from my bong when vaporizing does produce stronger effects and even more flavor." - Jason King, The Cannabible. Ten Speed Press, 2001
"Many people are surprised to learn that I use no water in my bong when vaporizing. According to a marijuana water-pipe and vaporizer study done by the Multidisciplinary Association for Psychedelic Studies (MAPS) and the National Organization for the Reform of Marijuana Laws (NORML), water tends to absorb THC more readily than it absorbs noxious tars. At first, I didn't believe it either, but I must say, removing the water from my bong when vaporizing does produce stronger effects and even more flavor." - Jason King, The Cannabible. Ten Speed Press, 2001