I thought we already reclaimed water from sewers, reverse osmosis and distillation is pretty legit. I know it doesn’t always remove all the flourine compounds.
Underground chinese street food vendors sometimes use refined sewer oil. After purification there is no biological hazards left, the hazards are actually stuff like heavy metals, and polycyclic aromatic hydrocarbon. I actually want to try some food fried in sewer oil, I got morbid curiosity and i’m too healthy for my age.
I’ll drink beer from distilled toilet water atleast.