use distilled water. i smoked with it, and it smoked smoother. i think this is the cause for all these contradictions between logical scientific proof (that THC is not h2o soluble) and experience (a joint or blunt gets you fucked up). tap water, which most of use use is full of flouride, vitamins, all kinda of shit. distilled water is pure H2O, meaning it will be better able to remove tar and stuff from the smoke. I smoked one bowl outta my double bubbler with distilled water last night and then watched a movie, fucked out of my mind. i was also high for a lot longer time