best way to dry iPhone6 dropped in water

Good for you for recognizing that rice is a myth. I'll give you my general advice on water damage as an independemt repair

professional that sees water damaged iPhones every day, which includes seeing many repairable phones turned unrepairable by the common practice of delay of treatment and hopeful powering on. It may help you for next time. Since this phone has already seen electricity while wet, it is too late to reliably save the phone.

Just like a bunch of wet bathing suits in a trashbag, there really is no solution to addressing water damage without having a professional open the phone and properly cleaning the board. You want to displace the water and its dissolved solutes, not let them dry on the board. For phones that are addressed while still wet, there is a really good chance of recovery. --almost always in fact. If you let the phone dry on its own--not so much.

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skip the rice--thats a myth, it does nothing and you don't really want to dry out your phone without displacing the water anyway. Skip the hopeful "let's just see if it turns on" or "maybe it just needs to charge". This is a sure way to turn a repairable phone unrepairable.

you can sometimes get lucky with an air dried (same thing as rice, which really doesn't do anything). But without removing the corrosion on the board, it will have a shorter lifespan---oxidation in the phone weakens solder joints.

Your option at Apple is an out of warranty replacement for $299. Some folks think that Apple will deny you for that OOW swap option if you do pursue repairing the phone first, but I've never seen that actually happen, but keep it in mind.

<Edited by Host>

The fact that you backed it up is good - the recommendation is to leave in rice for 5-7 days but the water damage sensor most likely has been triggered - you need to make a decision about whether you want to wait for it to (maybe) work or take it to Apple for purchasing a replacement

sounds like a good plan. You're welcome 🙂