What is used to distill bourbon whiskey?
A still. (Ha Ha.) A still is a closed boiler with an outlet in the top, which directs the evaporate to a condenser. The condensed matter has higher alcohol content than what was in the boiler. Usually the process is done three times, starting with mash that is 10%, doubling the first two times through, resulting in 40% alcohol, then distilled more carefully the third time through to raise it to somewhat above 50%. This product is then aged in single use charred white oak barrels for at least four years. Visit one of Kentucky's fine bourbon distilleries for much more information. (Or the one in Virginia.) Woodford Reserve, south of Frankfort, is highly recommended.