Paint the umbrella. The vodka evaporates very quickly so the umbrella won't get soggy as you do this, however once the vodka evaporates the food dye will stain your hands so handle this umbrella as little as you can once it's painted. You have been warned. This will leave dye on your hands if you touch it, but this is just for aesthetics, this is not for practicality. Don't forget to paint the inside of the umbrella for the best effect.