This is a refreshing vodka sour drink that is perfect for hot days. The concept is simple and follows the classic 'collins' drink formula of spirit, sour, soda. For example, replace the vodka with gin for a Tom Collins or with bourbon whiskey for a John Collins. By adding the soda to the glass first, its bubbles do the work of diluting, mixing, and agitating for you- eliminating the need for shaking. (Spirits/Cocktails)