The best meal replacement shakes provide calories, protein, carbohydrates, and a mixture of vitamins and minerals to mimic what's found in a meal—just crack open a bottle and sip.

Most of us are also familiar with the old adage: Drink eight 8-ounce glasses of water daily. The eight-by-eight rule advises us to drink 64 ounces (approximately 1.9 liters) of water daily.