Approximate calorie count: 110 caloriesThe secret to this drink is to get the natural sugars out of the watermelon juice, says Roxanne. The riper, the better. "Watermelon juice is rich in nutrients and is a perfect option for fasting, cleansing and dieting and contains a great dose of electrolytes per serving," she says. Champagne is a low-calorie beverage, due to its production process where most of the natural sugars are removed and no additional flavouring is added.