How to get water out of an iPhone 6s without opening it up?

How to get water out of an iPhone 6s without opening it up?
Added (1). I dropped my IPhone 6s in the toilet about a week ago (for a few seconds and I did suck out the water and turn it off immediately) and it has been sitting in a bag of rice and silica gels since. Two days ago I put it outside in the sun (it's about 45 degrees here) for an hour or so and a lot of water evaporated (I changed the rice twice because it was wet). Initially half the screen had water in it and when I turned the phone on today there only was a small line near the bottom corner remaining.
Added (2). So I put the phone back inside the baggy and I left it on a heater on minimum heat for about an hour but the line did not disappear. I turned on the phone and everything works (audio, speaker, camera, etc.) even the battery is still at 80% even though I haven't charged it for over a week. However it was only on for half an hour or so when the side that previously had a lot of water in it turned gray! I restarted the phone and it was fine again but I'm worried there is still water inside.
Added (3). Does anyone have tips on how to get it out? Should I leave it in the sun for longer? I do not have AppleCare and the external water indicator was not trigged. However, that could not be the case for the internal indicators because I have not and do not know how to open the phone. I also kept the phone off for the entire week/took the SIM card out to expedite the drying process.

Read more: How to get water out of an iPhone 6s without opening it up?