Acura died after getting wet! Help

I just bought an 03 Acura RSX Manual 5 Speed - four wheel drive with 21,000 miles and a clean repair record (so they told me). It drove fine for 14 days until I took it to the automatic car wash. After the sprayers went over it, it barely started and began to make a small rattling sound. As the day went on, the rattling got louder and the car started to loose power (greatly!) When you hit the gas. When I pulled it into the dealer, it died and wouldn't start (it wouldn't even turn over and try to start). Can water from a power wash seep into something? Do I have a loose seal somewhere that stopped the car from getting power and eventually killed the battery. Or do you think I bought a lemon?

Thank You