Pour Kool-Aid and pineapple juice into a glass filled with crushed ice and stir.
Top with lemon-lime soda.
Garnish with lemon, a maraschino cherry, and Skittles (all optional).
Notes
As long as you use the same measure for one part, the drink will turn out perfectly, no matter how much you scale it up. For those needing exact measures, for one drink, 1 part = 2 ounces or 50 ml.