Hi Miguel,
Ouch, dropping it in the ocean is close to the worst case scenario; there is an incredible amount of minerals and contaminants that your phone has now been exposed to. You really need to get that stuff out of the phone before you do anything else. That means opening up the phone and cleaning/soaking all the parts (except the display and maybe the speakers/microphones) in isopropyl alcohol to remove the contamination that's almost guaranteed to kill your phone.
Here's a guide on what to do; it's written for an iPhone but the principles apply to all phones.
[guide|95280|iPhone Liquid Damage Repair - iFixit Repair Guide|new_window=true]
Most commonly the parts that end up needing to be replaced after liquid exposure are the battery and the screen. It's entirely up to you how much you want to spend trying to resurrect this phone; at this point it's impossible to say if it's fixable or beyond hope. If it was mine I would probably follow the guide and clean it was well as possible, then spring for a new battery and maybe a charging port assembly. At that point I'd try and verify if there's any life in the phone, such as vibrating or being recognized when plugged into a computer. If so, then it might be worthwhile picking up a new screen and seeing if that brings it back to life.
Otherwise, you may want to consider locating a repair shop that specializes in liquid damage, but whatever you do, you need to do it ASAP, as you've already given the phone a week to corrode and get worse.
Good luck; let us know what you find!