It appears from the pictures sent back by NASA's Mars Reconnaissance Orbiter that at least half of Mars had water more than three billion years ago.
The key is that the Mars Reconnaissance Orbiter discovered extensive outcroping of phyllosilicate rocks "which include clays rich in iron, magnesium or aluminum, mica and kaolinite."
These kinds of clays are formed through contact with water.
Despite the confirmation that Mars used to be a wet planet, there is still no evidence that there was life on Mars.
But if there was life, the creatures probably didn't have diarrhea. "Kaolinite" is one of the ingredients in Kaopectate.
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