A drink available in a variety of flavors, mixed as a powder with water and sometimes sugar. Anyone growing up struggling financially, ergo living in the projects, would know that kool aid is not described by flavor, but by color, with the exception of grape. see below.
> bb: ay white boy, want some kool aid?
> wb: sure, what flavors you got?
> bb: we got red, blue, and grape
> wb: what flavor is red?
> bb: its red.
> wb: is it cherry?
> bb: damn, i said it's red! do you want it or not?