Dropped in water/working/goes on and off/wont charge

So the other day my iPhone decided to take a dip in the pool. It all happened very fast but I am pretty sure it made it to the bottom (4ish ft) before it was retrieved. While taking it the otter box off the screen started to flicker and then it just shut off... so I thought. I was on the phone with AT&T when my text tone went off. The phone was still on! I knew that it needed to be turned off but I couldnt. So I left it at a friends house in rice so I wouldnt be tempted to touch it. When i got back say 12 hours later ready to go to the apple store, I decided to plug it in a see what happened. It came on instantly. All was well until i noticed it said it was at 100% battery... Then it shut it self off. It immediately came back on at 1%. So I let it charge but it kept going on and off. Now it wont charge properly. Its been plugged up for sayyy 2 hours or so and is only at 15% and still turns on and off on its own. Help!!!