
...extracted from the URINE of cows.
The Big Bang Theory Season 4, Episode 22

It took me a gallon of URINE
to make that water.
The Big Bang Theory Season 5, Episode 15

The water the astronauts drink
is made from each other's recycled URINE.
The Big Bang Theory Season 6, Episode 1

How much URINE
do these suits hold?
The Big Bang Theory Season 5, Episode 24

It is. They're what hold back
the URINE and feces.
The Big Bang Theory Season 8, Episode 18