Add the ice water, granulated sugar, and powdered drink mix to a blender.
Blend until smooth and slushy.
Divide the slushie evenly between 2 large cups.
Stir NERDS candies into each slushie, using as much as desired.
Serve immediately.
Notes
These slushies are best served immediately. Store leftovers in the freezer for up to 2–3 days. Let them soften slightly, then stir or blend again before serving.Kool-Aid works well for this recipe, but you can use any flavor of unsweetened powdered drink mix you prefer.