I didn't say you could drink it! That is why I have the quotes around food grade.Reagent grade is not food grade. Isopropyl alcohol is NOT for human consumption! It has a different chemical structure than ethanol. That being said you can clean your pipes or brewing equipment with it with it because it rapidly evaporates, leaves no trace and you can rinse with water to be sure
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I said you could use it for cleaning your pipes and they do make "food grade" isopropyl alcohol for disinfecting surfaces used for food/drink preparation.