Case of 12 Bottles of Essence 20 ml Each Makes 1 Liter (Irish Whiskey) Case of 12 Bottles of Irish Whiskey Essence. 20 ml each Mix each bottle with 750 ml - 1 liter of unflavored alcohol (i.e. vodka) Also can be used in our oak barrels to add great oak flavor to your drink. Tasty formulation gives you the great Irish whiskey flavor, you just add the neutral alcohol and it's ready to drink