This article is from the Kool-Aid FAQ, by Paul and Bess Dawson-Schmidt firstname.lastname@example.org with numerous contributions by others.
Take the packet of dry Kool-Aid and pour it into a paper cup.
Add a squirt of conditioner and about 3 drops of water.
Mix it so it is kind of thick.
Wet the part of your hair that you want to dye, put it on (cover
your hands because it stains really badly) and wrap said hair in
Leave it in for 10 mins, and rinse lightly.
Blow-dry and style as usual :)