Bill Gates drinks your Poop

[Melbosa]

http://ca.ign.com/articles/2015/01/07/bill-gates-drinks-water-that-was-human-waste

OMG Waterworld we are ready!

[Mr. Analog]

We all do, it's called a water treatment plant

Along with poop (both animal and human)
There are corpses (both animal and human)
Chemicals
Metals
Bitumen
Medical waste
Grass
Trees
Leaves
Goose poop (separate poop category if you ask me)
Old levis
Broken bikes
And at least one prehistoric beast on a never-ending feeding frenzy
Lost homework
Hockey pucks
Semen
Car tires
A single boot
Lots of beer cans
Gasoline
The "flushed stash" motherlode
and maybe some water

[Melbosa]

This one is smaller

[Mr. Analog]

This one is smaller

If the Romans could figure it out then Bill Gates can too