Why is water leaking onto the floor, of the passenger side, from the a/c?

The evaporator drain is clogged. Crawl under passenger side of vehicle ( should not need to jack it up, if you do, use safety precautions ) you will see what looks like a down spout vacuum hose,not connected to anything, run some wire up those hose and get ready for a bath. Very common issue with any a/c system.