How is it you can't find any good info on the net? It's all out there, you just need to find it! lol

How about this one?

YouTube - How to make and use a waterfall bong

Although I like to make mine out of cooler bottles than just normal two liters. But work with what you got.

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"I've know I've wanted to be a clown since I found out clowns were just people with makeup."
~Cam