We’ve all had this problem. You try to stick your towel in there. You stake your head and bang it to the side. For hours. But there’s a simple solution:
Hop up and down on one leg, the leg on the same side at which the water is in your ear. The water will simply flow out.
Edit: Herman’s method in the comments also works, counter-intuitively to add a few drops more water, which will cause what’s already in there to flow out.
LoneSwimmer 
As weird as this might sound, I find the easiest way to get water out of your ear is to pour MORE water into that ear with your head tilted to the side, and then tilt your head to the other side and the collective water all comes out.
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