I dropped my iPhone in water, now the home button is spazzing out?

So I dropped my iPhone in water a while ago and I set it dry out/dried it out. The phone still turns on and everything works fine BUT the voice control keeps popping up. I'm assuming water got to the circuit that controls the home button, so now it will randomly close out of apps, start playing music, etc. It's extremely inconvenient and embarrassing when it happens in quiet/public. I have spent many hours looking online for a solution, and I can't find one. I have enabled the guided access feature so that I have a touch screen home button, but I can't find a way to disable the physical home button or to disable voice control all together (I've already disabled Siri). Please help! I use my phone for filming videos/vlogging and I can't afford a new one right now.
iPhone 5s

Its water damaged so who knows.

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