Guess where my dash water leak is coming from.

There's only "so many places"

Windshield gasket

Debri in cowl has plugged drain holes, and comes "over the top" of the cowl vent "rims"

(Drain holes are down in the corners out near the hood hinges)

Rusted through the cowl "bottom"

Other damage, such as previous crash damage has cracked a seam, weld, or even sheet metal itself.

"Someone" drilled a hole in an unfortunate spot LOL