If you go to any farm supply store they sell 1 gal. jugs of Peptol Bismol for $10. Marketed for livestock but made by the same company on the same machine. They just know that people will pay more for it in a small bottle.
Of course if you need a gal. of it you might have a more serious problem than money :-/
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"Empirically observed covariation is a necessary but not sufficient condition for causality" - Edward Tufte
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