Yes, they do exist.
"Water-coolers" were installed where I worked, as were vending machines that supplied almost-liquids in a variety of shades of brown-ish. The building used "grey" water, recycled rainwater and such from the seagull-frequented rooves and such, for flushing and I suspected the vending machines were supplied *after* the flushing - possibly after extracting all of the di-hydrogen monoxide from the concoctions. People did chat around the various sources of sludges, that was a far better choice than attempting to drink any of them.
I was unreliably informed that the "water" coolers supplied tepid as well as cooler quasi-fluids, though I have no idea whether that wasted more or less time than any other temperature of alleged potable.
