How to fix a MINORLY water-damaged iPhone 6?

Ok. So, yesterday I spilled maybe 1/10 of a water bottle partly on my phone. I dried it off and it worked completely perfectly. Then, I noticed minor condensation on my camera lens. So, I waited for that to go away, and it did go away by its own. Now, almost 5 hours later, iPhone is working almost perfectly. I went to sleep with my phone working fine, but my Touch ID and volume Up button wasn't working well. I woke up and my phone is glitching. I turned it on twice, and I realized it had damage.So, I just wanted to comment that after spilling the little bit of water, it still worked perfectly fine for approximately 5 hours, and suddenly wouldn't turn back on. Thank you for any help!