What are drinks that have electrolytes?

There is an assortment of drinks available that contain electrolytes such as Gatorade, Powerade and Accelerade. All three of these drinks are recommended for running and other sports. Reviews from various sources mention that if you are training excessively over 4 hours a day you would need a higher intake of electrolytes than what the previous mentioned drinks offer. Also, there are recipes available online to make your own electrolyte drinks.