IPhone 4s got wet and now it won't charge?

About a month ago my I fell in a lake with my iphone in my pocket and it got wet. It still worked and the water damage indicator is still white. The only thing now is it won't charge. It died and I plugged it in and it says that it's charger but then after a while it stops and just shows the connect to power symbol. It won't turn on. I really can't afford a new iPhone. How can I fix this?

Added (1). Now it's completely dead and won't show anything at all.

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