Kirkland Signature American Vodka 1.75 LFrom field to bottle, Kirkland Signature American Vodka uses only the finest grains and pure spring water to create this special vodka. Process: The grains are loaded into a cooking chamber and mixed with purified spring water. This mixture is then heated to convert the starch into sugar. The mixture (called "mash") is transferred to a fermentation tank, yeast is added, and the mash is left to ferment for two to four days, converting the sugar into