DIY Kool Aid and Food Coloring Tattoo. First off there is no source - even after breaking apart the Pinterest collage and searching for the photos individually. So I’m going to label this Pinterest here. Second, lots of things do not work that are posted on Pinterest (the new breeding ground for the urban legend) so I have no idea if this works or not. Instructions: Homemade Henna tattoos! 1 packet orange Kool-Aid, 1 drop green food coloring, 1 cup water. Paint on, let sit for 1 minute, pat dry. Lasts over a week!