Water in the passenger foot well, or coolant? Press a paper towel to the floor and see if the water is green. If so, then you have a leaking heater core. A heater core is pretty cheap, but the labor or installing one is pretty intense.
If it's just water then do you notice this more after it rains? If so, then it could mean the drainage system for your cowl is clogged and is causing it to back up into the vehicle.
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