If you're headed somewhere near water and don't want to spend money on a waterproof phone case - or forgot to order one ahead of time - here's the next best thing: find a sandwich bag to keep your phone safe from any splashes. You can navigate it (press buttons, scroll through Insta, etc.) just as you normally would; the only thing that's not the same is taking photos.
This hack also helps on beach days when you don't want sand to ruin your phone. Huzzah!