Touch screen unresponsive on iPhone 5?

My iPhone 5's touchscreen is not responding at all. I tried to reboot it already and took off screen protectors.might it have water in it because a few drops of water seeped through the waterproof case when i dropped it into the deep end of the pool. Do i need to take it to apple or is it something stupidly simple?

Smash it.

Take it to the apple store i think they will change the screen.