Well did you run threw any water?
when you put the key in the car and turn it, do you hear a buzzzing/humming sound coming from the engine?
Did you try putting a spare key in?
hmmm Try disconnecting the battery for a few hours and try to reset everything?
If all still doesn't work.....try going threw all your fuses and relays.
if all of that doesn't work.......get your alternator, and battery tested......lol im just trying to shoot to ya some DIY'ers