Its usual some time we fall our phone in water. Some time it works some time it doesn't.
here is my guide to make it work.
First of all see your phone is off or on if its off then dont turn that on again or not even try for that. If its on then turn that off.
2nd make it dry by towel
3rd step put battery, sim card, memory card all out of the phone.
4th and very important step take a bowl of dry rices put your phone in it make sure phone is fully inside of that bowl and keep it inside at least for 12 hours or 1 day.
Here you go you got your phone back without any issues :D