Water my driverside floor wet

Since is should not be the heater core,(and coolant - since you don't mention losing any) it is probably either the door seal or the winsdshield seal that is leaking. And I assume that the floorboards are not rusted out either. You can take a hose with water, (and the floor boards dry) and run some water on the windshield, and around door opening and glass to check. If the winshield has been changed, and it leaks, it can be sealed without removing the glass with windshield sealer or the commercial windshield adhesive, which is what I use to repair one that didn't get enough adhesive the first time. If the leak is around the door, you will need the get the seal from the dealer or have it changed at the mechanics shop. I use the proper adhesive on these. Hope this helps. Rick