This gonna be your super hero origin story?
Shitman
Oh shit man!
Public Restroom Unflushed Poop Man
And we will absolutely, positively never know.
It also might have tapeworms.
Or a few hundred other nasty things
Or it could kill you
Excited DIYers running out before doing research: please note that in a medical setting something like half of potential donor poops wind up rejected because of unsuitable bacteria living in the gut that could make you sick.
“What do you do for a living?”
“My poops are the right kind of poops. So doctors pay me to take my poops so others can eat them.”
“…what?”
Yup, see also the specimen preparation section of the linked Wikipedia article
Poseidon’s Kiss might have healing powers if you’re lucky.
The IRL holy grail is a toilet.
Drink from the wrong one and you forfeit your life in the most horrid of ways.