Pour the Kool Aid drink mix into a measuring cup and add the cold water, stirring until fully dissolved and the mixture is vibrant and clear.
Add sugar or sweetener if desired, and stir until dissolved. This will enhance the tangy sweetness of the slushie.
Secure the lid and blend on high speed for about 30-60 seconds, until the ice is crushed and the mixture is slushy and smooth.
Stop and check the consistency; if it’s too thick, add a little more cold water and blend again briefly.
Pour the slushie into glasses, allowing some of the icy texture to be visible on top.
Optional: garnish with a slice of lemon or a colorful straw for a festive touch.
Serve immediately with a spoon or straw to enjoy the cold, tangy treat.