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Now you can make a home clone for this refreshing citrus beverage in no time at all. Just add lemon and lime juice to a syrup solution, along with a little Kool-Aid lemonade drink mix for that special tang thanks to included citric acid, and you're almost there. When the syrup has cooled, mix it into some cold soda water in a 1 to 4 ratio. That's it. You've just made this clone of 7-UP yours.
Source: Top Secret Recipes: Sodas, Smoothies, Spirits and Shakes by Todd Wilbur.