iPhone 6s Plus condensation in camera lens and flash

There are various opinions on using rice, but for the most part it sounds like it's a myth or at the very least mostly ineffective. The silica gel that Lawrence recommended will work to some degree. This is the kind of stuff I've seen packaged in food or maybe in a shoebox. I've heard of some small dehumidifiers for water damaged electronics. The other problem is that your phone is still sealed (except when taken apart or when the SIM tray is removed), so how is the water going to get out?

This describes a pouch with a desiccant designed to absorb water from electronics. It's called the "Thirsty Bag". It's apparently no longer sold, but I'd trust something like this over rice. Of course if you're in a hurry you're not going to be able to find one in time.

Using desiccants to soak up wet electronics - CNET

I had a look at my wife's 6s+. I think it there moisture behind the lens cover, that's still inside the case. Apple might still consider that liquid intrusion. It doesn't sound too bad, and the OP didn't express any interest in have Apple fix it due to the cost.

Even if it's not water resistant, it's still sealed with an adhesive even if it's not watertight. How does to water get out?

y_p_w wrote:

Even if it's not water resistant, it's still sealed with an adhesive even if it's not watertight. How does to water get out?

The same way it got in, but easier, because it's vapor and not liquid on the way out.