Pour the Kool Aid powder, sugar, and cold water into a large mixing bowl and stir until the powder and sugar are completely dissolved, creating a vibrant, flavorful liquid.
Transfer the Kool Aid mixture into the blender jar, readying it for the icy blend.
Add the ice cubes to the blender, filling it up for a frosty, slushie texture.
Secure the lid on the blender and blend on high until the mixture is smooth and slightly thickened, with a frosty, icy appearance.
Stop the blender and check the consistency—if it's too thick, add a little more water and blend briefly; if it's too thin, add more ice and blend again.
Once achieved, pour the colorful slushie into glasses or cups, topping with additional ice if desired for extra chill.
Serve immediately with a straw or spoon, enjoying the icy texture and bright flavor of your Kool Aid slushie.