The passenger side floorboard gets wet =

Is it only when the ac is on? there is a pan under the ac unit that has a hole in it to allow the condensation to empty. if that hole gets plugged it could cause the condensation to build up and back into the inside of that car. i unplugged mine and floor stayed dry

You could have a leak in your passenger side front windshield gasket that is dripping down the A-pillar onto the floorbaord or you could have a hole in your lower firewall or floorboard. I would pull back the floor carpet and using a water hose run it on the windshield so that the water is running near the passenger side and try to see or follow where the water is running down to.