Made this simple bong using a water bottle, a pen (to poke the hole), a trumpet mouthpiece, and a rubber band. Works like a charm! : r/StonerEngineering
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how to make a bong out of a water bottle: How to make a Water Bottle Bong
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Puffco Budsy Water Bottle Bong / $ 69.99 at 420 Science
Water bottle bong : r/StonerEngineering
How to Make a Pipe or Bong out of Almost Anything
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