i have no idea whyd you want to use anything other than water in a bong. anything sticky id worry about fucking with my glass. i have a phx duo and i love the cold water in the ashcatcher and beaker bottom and stacked with ice....but lately recently getting some hash i tried putting hot water in the beaker bottom and ashcatcher with no ice and i think it hits better. im not sure if i wanna put ice in since it could dull the hot water but im not sure...