You can get it from your contact lens solution.
Well, well, well...look at you: Livin' in the big city, but still clutching to your small-town Portland bias against umbrellas!I can't wait to see how you deal with your first New York summer. You'll be bitching as soon as the mercury hits 91 and the humidity turns the air into a crushing semi-liquid form. Then it'll be the New Yorkers' chance to mock you! :-P
Thanks for the Christmas presents, GB! :)