First prepare your surface and a place fo the eggs to dry. I like to place a wire cooling rack on paper towels so that the finished eggs can be placed on the rack to dry and the paper towels absorb the drips.
Then for each color or packet of Kool-Aid, add ½ cup hot water, 1 teaspoon vinegar, and one full packet of Kool-Aid mix to a cup and stir until the Kool-Aid powder is dissolved.
Gently place your eggs in the cup (one egg per cup) and let sit for 1-2 minutes or until the desired color is reached.
Remove the egg with a spoon and gently lay it on your prepared surface to dry.
Allow the eggs to dry completely before placing them back into the egg carton.