Stone Imperial Stout. Classic craft stout. It is also now the base for Stone Imperial Whiskey. In partnership with Iowa’s Foundry Distilling Company, the “whiskey is made with the wort of Stone Imperial Stout (liquid resulting from the first stage of the brewing process), distilled and aged in 30-gallon charred oak barrels for 30 months. This is a monster of a whiskey clocking in at 127 proof.”