Originally Posted by Tark

maybe it just went out yesterday... if the alternator doesn't work then the battery will supply all of the power. If your battery had enough power you could drive it until it finally dies. then try to resart and boom no more power cause it wasnt recharging.
Maybe it's the battery.
Maybe you battery connectors are corroded did you clean them yesterday, if not try it.

Do your self a favour and bring it to a garage, they'll diagnostic the problem for you... but then again for the price of a towing over there you might as well just buy a neww battery drive it at your favorit garage.