Hello peterk9 and all, Yes, verified it is just plain / clean / rainwater. Had it all cleaned up, and mostly dry, it rained today, sitting outside on level ground. Water in the front on driver floor again, and also in the backseat floor behind the driver seat. Understandable as there is a body line in the floor that acts like a channel to collect the water. I believe it's coming in from the door seal and getting UNDER the carpet, not running over it. Seems to be following the door seal underside and running in. There is a gap there, in the door seal at the middle of the bottom part. I've pulled up the carpet, and it pooled there next to the electronics that are there, on the top side of the footwell - area that would be covered by the plastic trim EXPLORER plate.
It was too chilly here today to sit in the car and have water sprayed on it. I'll try that tomorrow to see if I can pinpoint where it is coming in. I think it's coming from up high and following the track all the way down before coming in. Perhaps some sealant under the weatherstrip? The other thing I noticed, the plastic cladding on the door pillar next to the windshield is NOT tight to the vehicle and I can wiggle it. As far as I know the windshield IS original, but I am not positive. It does have the soundscreen logos on it. I hope it is sealed well.
Tips on finding it? can I stuff plastic shims or putty knives in to stiffen the seal / spray water on it with a hose from outside while having someone watching from inside?