How can I know what still works of my iPhone 5s

My iPhone 5s has been dropped in water a couple of months ago. I didn't have money or time to get it fixed, or fix it myself. Now that I have time, I have decided to do it myself. but I want to know what still works, so that I know what to order/replace.

Since it has been a couple of months, the battery died completely, but when I plugged it into my computer it detected the iPhone after a couple of minutes. Also when I unplug and replug it, it gets detected right away. Can I conclude that the battery still works out of that? Unfortunately the LCD doesn't work anymore. I do know for sure that the home button and lock button still work, because when I hold those it gets disconnected from my computer and gets reconnected after a minute.

I don't know how to figure out if the speakers, vibration, volume up/down, vibration button, digitizer, fingerscanner and the front and rear camera still work. Since it got turned off because the battery died I can't reconnect it to iTunes because I need to unlock it for that.