It's probably too late but I hope to help others which may have accidentally dropped their iPhone 6 in water.
I had the same issue about 2 weeks ago.
I left my iPhone 6 Plus on the side of the bathroom sink and I while I was doing pushups on the floor the iPhone fell by itself into the sink which was half-filled with water.
When I got up I was struck by the sight of my jewel being under water and I grabbed it immediately, dried it with a towel and turned it off. I also did shake it a bit to get more liquid out of the insides.
I immediately did a Google search which led me to the Apple Communities, and where I read other member's experiences.
This is what I did: I got a plastic meal box, filled it with dry rice, covered the headphone and charger holes with small silica anti-humidity packs (used adhesive tape to hold them in-place) and WAITED 7 full days. I changed the rice half-way through the week.
Patience is key here. Please, don't turn on your device before 7 full days.
If you have Apple Care you can get your device replaced by paying 79.99$ I think. But why pay 80$ if you can get it working again for free?
Hope this helps the Apple Community.
Before closing the message, here's a final tip: please don't take the iPhone to the bathroom, kitchen, beach or near the swimming pool. Better be safe than sorrow!