Black and green screen after water

Well I did this huge accident by dropping my iPhone 5 into the toilet, but it was only in there for 2sec. I dried the phone and it was still working, but after a while it turned itself off. As a reaction, I hurried starting it again to check if it still was working and it was. But after that, my friend told me to turn the phone off again as soon as possible.

When I got home, I placed the iphone in a bag of rice without any air in it, and waited over 24 hours to check it.

When I checked it(which I think I did too early)- it worked, and I was so happy! Everything, the sound was just fine, but after a while it didn't respond to my touches and suddenly the screen became black and green pixle-ish and grumsy, but I could still see something in the background.

I placed it back into the rice, but this time on my bathroom floor in a bag, because it's warmer there.

I don't dare take it out before I know that most of the water is gone, but at the same time I don't know what the problem with the screen was. Is it possible to fix it? I think I maybe can get some help from a friend, but it would be nice if anyone knew what i could do, or what the problem is.

I also read about people who got problem with black and green screen on their iPads. Everyone who read the thread had hit their iPads on the backside of the iPad and it got normal screen again.