Dissolve a packet of Kool-aid in a cup with 2/3 cup water. Whisk until the kool-aid is dissolved into the water.
Continue this process until you have each color dissolved in water in a separate cup.
Place the hard boiled eggs in the cups and allow them to get completely covered with the kool-aid mixture. Let the eggs soak for 5-10 minutes until the eggs are the color that you prefer. The longer the eggs sit, the more vibrant the colors will be.
Use a spoon to remove the eggs from the cup and place them on a wire rack on top of a baking sheet to cool completely.
Notes
As the eggs are drying, you can easily use a Q-tip to create fun designs on the eggs! If you want multiple colors on one egg, you can spoon the mixture over the portion of the eggs you want dyed while the eggs are on the wire rack to get the pattern/design that you like!