5. #5 Best Drink for Hydration: Coconut Water: Vita Coco 100% Pure Coconut Water (1 bottle, 17 fl oz)

90 calories , 0 g fat, 22 g sugars

A 2012 study in the Journal of the International Society of Sports Nutrition found that compared to a commercial sports drink, coconut water—a natural source of electrolytes—was equally as effective in hydrating participants after an intense workout. So why choose the coconut water over the sports drink? For one, coconut water is low on the glycemic index, so it won't dramatically affect your blood sugar, while fluid-replacement beverages like Powerade are sweetened with high-fructose corn syrup, a high-glycemic-index sweetener that can spike blood sugar levels and promote body-fat storage. Second, a 2010 study in the Journal of Cell & Tissue Research found that coconut water helped reduce blood pressure and cholesterol in rats, suggesting that the drink may also promote heart health.