Water makes the wheels go round but not without its electrolyte friends that carry electrical charges and help your heart pump blood. Sodium and potassium are the big players that are depleted in your body as a result of sweating. To replenish these essential minerals, is best to sip about 4-8 oz. of sports drink such as Powerade or Gatorade with a 6-7% carbohydrate solution every 10-20 min. This will have carbohydrates as well and will factor into how much carbohydrates you should be having every hour of activity on your bike.