[MagicRat]

Water leaks can be very difficult to detect because water can run down internal structures and drip a distance away from where the actual source of the leak is.

I would suggest run both front seats all the way back and get right under the dash, on the floor if you can, and look up under the dash with a good flashlight.

Have a buddy run a garden hose over the outside front of the car. Focus on the fresh air vent intake, just in front of the windshield, and around the windshield frame itself.

The idea here is to move the hose slowly over specific areas while you look for a leak. Hopefully you can find the specific source for the leak and address it. You may be able to seal the area with automotive silicon, depending on the leak You might have to remove the outside air vent intake grill or trim to get to the leak.