It could be a handful of things that are the problem. Water could have shorted both the front speakers out. They both could have just died at the same time (maybe not from the water issue). Moisture or water could have done something to the radio wire harness that only effected the the front left and right speakers. Trying testing the connection with another speaker, one that you know works. If it works then it was the speakers. Remove the door panels and test with a voltage meter.