Of course there isn't much water pressure in a bowl of water but as the video demonstrates if you drop your device in the sink or a puddle, you may be okay.
Take a look below...
● First Drop Tests of the iPhone 6s and iPhone 6s Plus [Video]
● iPhone 6s Plus is Much More Difficult to Bend [Video]
● iPhone 6s vs. iPhone 6: Time-lapse at Sunset [Video]
● Boot Speed Test: iPhone 6s and 6s Plus vs. iPhone 6 and 6 Plus [Video]