Water Damage to my Verizon, Help Needed!

So I had a soccer game out in an open field, with the rain comming at any minute. During our game, it rained like a mother, and did not stop for about 20 minutes. I had my Verizon and shoes in a Nike napsack, so i assumed it would be allright. After the game I checked to see my bag was soaked, and my phone covered in rain. A quick flip open and it looked allright, so i dryed it off and went home.
The next few days I noticed it would turn on OK, but after 10-20 minutes, it would shut down as if turning off, then turn on again, stopping whatever I was doing (calling, tetris, anything) It has done this the past 3 days, making it extremely difficult to make calls, and just enjoy my phone to its full use.

What can i do to fix this, in the cheapest manner possible? Can i get a free replacement? Is there a code i can activate to restart it? Can I bring it into a tech store to get it figured out?

I frankly have no idea, and help would be needed ASAp, as i need it a lot in the comming week.

THanks lot in advance

When I had water damage to a phoen I took it apart and blew it out real good with light pressure from like a dust cleaner you use for a computer. Then left it open for a few days to finish drying and when I put it back together it worked.

As far as codes no it is the water in there that is causing the unit to restart and so on. Just needs to dry and maybe it will work. Otherwise new phone.