Wet iPhone 4s - covered with a Lifeproof Case already

My iPhone 4s is covered in a Lifeproof case. At my batch retreat yesterday, I wanted to take pictures underwater with my friends so I brought it with me to the pool. Little did I know that a little water went in, eventually, affecting my phone's function. I dried the phone; dried the "plug" part with tissue and even blowered it. The flash is lighted; even the vibrate button still worked but it didn't after a while. Now that I'm home from the retreat, I tried syncing it in iTunes and the only thing that pops out is the "charging" icon. It then turned into the Apple or the "restart" logo. Afterwards it turned black. Blank. Nothing.

Can somebody help me, please?

Place your iphone in a bowl of dry rice, rice absorbs all moisture. The place it in a warm place like the airing cupbard in the bowl with the rice and let it dry out for 24 to 48 hours.

Http://www.ioffer.com/i/iphone-4-4s-external-battery-backup-case-536760640