How to fix my overheating iPhone? - 1

Warning: Long story.
So a little over a month ago, I dropped my iPhone into a kiddie pool. I quickly fished it out, fiddled with it to make sure it was okay, turned it off, and plunked it into a bag of rice. I left it like that for two weeks, and it came out still functioning. Mostly.
Every time I turn it on, it works alright for a few minutes. Then the screen begins to dim and I get the overheating screen. The process repeats every time I turn it on.
I can't sent it to Apple for repair as it wasn't originally my phone (my girlfriend gave it to me to replace my iPod after she cracked the screen and got a new one. I don't have service) and I don't have the money?
Any suggestions?
Also, my coworker suggested wrapping it in socks and sticking it in the dryer for a few minutes. Should I try that?
Please answer, I miss my iPhone baby.

No, do not put your phone in the dryer.

It looks like you fried parts of the circuity in the phone. You might want to consider having your friend send the phone in for you herself, if the warranty is still good.

If not, you can tweak around with some settings to cool the iPhone down suggested in the linked guide below:

http://ios.wonderhowto.com/how-to/prevent-overheating-ios-7-for-much-cooler-iphone-0147521/