A classic 20-ounce bottle of lemon-lime Gatorade contains nearly one-eighth teaspoons of salt and 80 milligrams of potassium — electrolytes "to help replace what you sweat out," the product's ads say. Powerade, another top sports drink brand with flavors like Peach Pucker and Grape Shocker, boasts "50% more electrolytes" than Gatorade. U.S. consumers spend more than $10 billion a year on sports drinks, according to Beverage Industry, a trade publication. That doesn't include, Read more