Make your own bitters at home to enhance your medicine cabinet, and your bar! Used since the Middle Ages, bitters are made by combining various plant botanicals andor spices with 100-proof alcohol and letting them sit until the bitter and medicinal qualities have been extracted. Just a small amount of the resulting liquid can then be used to stimulate the digestive system and promote healthy digestion. This is why "apertifs" and "digestifs" are so popular--both then and now!