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1.
A classic phrase used by Max Hardcore to calm down his female costars who were surprised and disgusted to find out that they're expected to drink his urine.
From Max Factor 10:

Lain Oi (crying): Did you just fucking piss on me?

Max: Honey, it's just water! Taste it!
by MeatTycoon April 26, 2009
 
2.
A phrase commonly used by someone to get out of cleaning up a spilled liquid, regardless of whether or not the liquid is actually water.
John spills his Coke on the carpet.

Tim: "Hey man, clean that up! This is a new carpet!"

John: "It's just water."
by Neganova October 23, 2011