2000 Dodge Durango water passenger side a lot of water in floor board.

Does the water smell like coolant? Are you losing any coolant from your radiator/reservoir? If so, you have a heater core leaking. It's a large job to replace, requiring removal of the dash.
If it doesn't smell like coolant, it may be that the drain tube from your a/c evaporator is plugged, and condensation is leaking into the passenger compartment. Look for the drain tube on the engine side of the firewall, in front of the passenger and down low. It should be a rubber tube that has nothing connected to it.
Other possibilities are leaking sealant around the windshield, bad weatherstripping around the doors, and leaks from sunroof (if you have one).