FermFast Tennessee Sour Mash Whiskey Liquor Essence is a unique liquor essence flavoring modeled after renowned Tennessee sour mash whiskey brands. Instructions: : Pour the contents of this bottle into a 1 L bottle. Add 26.5 fl. oz. (750 ML) of 35-40% ABV grain alcohol, neutral vodka or “swish barrel” alcohol. Mix thoroughly. Makes approximately 27 fl. oz. Ingredients: Natural extracts, essential oils, propylene glycol, water, caramel color and natural smoke flavoring.