Cocktails don't have to be such diet killers. You don't have to wake up with a hangover that defeats the day after. Your immune system doesn't have to be completely depleted after a dozy. You don't have to wake up feeling listless and moody in the morning. If you are a smart cocktail consumer you can choose multitasking mixers that make your drinks do double-duty: they'll make you feel good and your body will thank you the next day.