This Great Geysers Kit from ThinkGeek sports a “quick-release rig that lets you remain a safe and dry distance away from the ensuing fountain.” Video after the jump.
Rock salt, sodium bicarbonate, citric acid and ordinary table sale might improve the action of your geyser, or it might not! Does macaroni get the same reaction to diet cola that Mentos does? Does sugary cola work better than diet? Science is about forming hypotheses and experimentation, so you’ll have to try and see