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.

Briefly, "the realization that each random passerby is living a life as vivid and complex as your own." Originally from the Dictionary of Obscure Sorrows, which has a lot more beautiful neologism definitions like this you might enjoy.

the water of the ghettos

the universal drink of the hood.

A drink with a variety of flavors.

The universal drink of the ghetto.
comes in many flavors such as grape, cherry, blueberry etc, but known to the ghetto natives as red, purple etc.

also used as a slang term to describe a situation.

a cheap refreshing drink that comes in the form of a powder in a packet. Comes in many, many flavors. Just add water. Non-carbonated, the drink is promoted on TV by the walking Kool Aid pitcher. He holds a picture and a cup filled with the drink and says "Ohhhh yeahhh!" as he crashes through a wall. Jim Jones and his People's Temple cult in the Jonestown compound in Guyana commited mass suicide by drinking Kool Aid laced with cyanide.