Okay, so I decided to try putting dry rice in my bong and smoke through it. I filled up the bong with dry rice, nothing fancy, just plain, white rice, and I filled it so about 1/2inch of the stem tube was covered. I smoked and the hits were as smooth as they would be through cool water.

I eat my words. Dry rice in the bong worked for me and now that's where the rice stays...in my bong. I say try it for yourself. It may sound silly, but it's better than changing bong water, or spilling it, where it soaks into your carpet and stinks forever.