Kool-Aid Taffy: 2 1/2 cups sugar   3 tablespoons cornstarch   1 cup light corn syrup   1 1/3 cups water   2 tablespoons butter softened, plus more for buttering hands   1 teaspoon salt   1 package (6g) black cherry Kool-Aid (or any unsweetened fruit flavored drink mix)   1/2 teaspoon vanilla extract
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