The Advanced Tea Substitute appears in the video game The Hitchhiker's Guide to the Galaxy. It is what the Nutrimatic Drinks Dispenser gives you if you use it before you replace its control panel. It can be used to power an Infinite Improbability Drive, as it is a producer of Brownian Motion, but it is not as good at this as tea is.
It is likely a version of the same drink as the Nutrimatic's creation in the other versions of Hitchhiker's which was described as "almost, but not quite, entirely unlike tea."