leaking!!!

A thing that you don't want to happen just as winter hits us! it coming straight down onto the fuse box but think I may have fixed the passenger side! covered a small hole which looked like water was dripping out of. But for the drivers side i have taken the lower dash bits off and have looked under, taken the heater hose out and has see water sitting on top of that! but look up to where it must have been dripping from but there is no sign of water?

I poured a lot of water into the bit where the heater is and nothings coming in so it has really confused me as to where the water just drips onto my break foot when I'm driving! rather annoying, ha ha get out the car and i just got 1 wet foot, not a good look!
If anyone has had any problems with leaking could you give me any ideas as to how to fix them, I'd be very grateful

thanks a lot Calvinp