2009 Ford Mustand - Water leaking from underneath the passenger side dashboard?

It was pouring down rain the last few days and I noticed what appears to be clear water (perhaps rain water) leaking from underneath the passenger side dash board. I used a few towels to mop up the water on the floor. Is there a fix that I, a non mechanic (me) can fix this. I just had to spend $500 on a brake job.

Does the water smell a little sweet? If so, it's engine coolant from the heater core. Replacing a leaking heater core is a big job and I always pay someone else to do it.

If the water does NOT smell sweet, it's probably condensate from the air conditioner. That would mean the drain is clogged. The drain should be a short rubber hose at the bottom of the firewall on the passenger's side of the engine compartment. Check that the hose isn't clogged.