I dropped my phone in water and now the screen isnt working - i cant remove the battery
The first thing you should do when dropping a phone into water is switch it off immediately and make sure it's completely dry before turning it on again. Keep it inside a case of rice so that the rice can soak all the moisture from the phone. Keep it inside for a day or so and try turning it back. 

So try doing it now and hope it works else you'll need a new phone.