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http://www.waytoomany.com/vids/weed/gravity_bong.php
CLICK THAT LINK. IT GIVES STEP BY STEP INSTRUCTIONS ON HOW TO BUILD A GRAVITY/WATERFALL BONG.
sorry for typing in all caps but this is what I use and it works great. It gets you high on so little weed. Use it.
Also, once the water reaches the hole i like to take the top off plug the hole and cover the top and shake it. The remaining water works to cool the smoke so it isnt so harsh and so you dont cough like the guy in the clip.
http://www.waytoomany.com/vids/weed/gravity_bong.php