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Put on a big red smile. Now you can make your own version of the popular convenience store slush, complete with brain freeze. You must have a blender to make this clone of 7-Eleven's Slurpee, and enough room to stick that blender into your freezer to get it nice and thick. This recipe gets close to the original with Kool-Aid mix and a little help from cherry extract, but you can make this drink with any flavor Kool-Aid mix (if you decide to make some variations, don't worry about adding extract). This recipe makes enough to fill one of those giant-size 32-ounce cups you find at the convenience store. Now I should hack the spoon-straws.
Source: Top Secret Recipes: Sodas, Smoothies, Spirits and Shakes by Todd Wilbur