Greyed out Wi-Fi on my iPhone 4?

I lost my phone two days ago at a golf course and found it yesterday afternoon after going back to look for it. It rained the night before so my phone had some water under the screen but no significant damage with the touch screen or buttons. Everything still works on my phone just fine except for my Wi-Fi connection. It's greyed out and gives me no options to turned it on. It's just stuck off. What happened to it and is it fixable?

Added (1). I did put my phone in rice for a while, not 24 hours long but at least 9.

I'd power that iPhone down now!

Put it in a bag of rice and let it sit undisturbed for at least 24 hours.

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