Psychoactive Particle Injector
"An experimental device that injects psychoactive particles into the water supply."
In-game description [src]

The Psychoactive Particle Injector is found in Life Support, on the body of Tobias Frost in a maintenance tunnel across the hall from the security station. It is used in the optional objective "Psychic Water", which causes drinking from water fountains to restore psi points as well as health points.