Quick steps
1. Turn off the power & take out the battery
2. Immediately dunk the Camera, Cellphone, Mp3 player etc in a tub filled with Distilled water for 3-6 hours.
3. Take out, let it air dry for a day then place in a zip lock bag filled with rice to absorb whatever water remains.
4. Take your gadget to the nearest service center if it does not turn on. At times, It gets a second lease in life after this method.