Salty Limeade
Limeade is popular throughout Asia and often served salty. It will take some experimentation on your part to determine whether you like it really salty—in which case you should reduce the sugar substantially—or sweet, like lemonade. You might be surprised; salty limeade is usually considered more refreshing (and makes a good substitute for sports drinks). You can omit the salt entirely to make standard limeade.