In a mixing bowl, whisk together the Kool Aid powder, sugar, and water until the sugar is fully dissolved and the mixture is vibrant and uniform in color.
Pour the mixture into a freezer-safe container, spreading it out evenly, and place it in the freezer.
Freeze the mixture for about 4 hours, checking occasionally; it should become solid but still scoopable.
Once frozen, use a fork or spoon to scrape and break up the slush into icy, granular chunks.
Serve the Kool Aid slushie in glasses, optionally garnished with fresh fruit or a slice of citrus for extra flair.
Enjoy the refreshing, icy texture and bright flavors as a cool summer treat!