Toyota Corolla dash warning light?

I don't have my owner's manual with me, but, my 2009 Toyota Corolla had a warning light come on. It looks like an exclamation point over some fluid. I'm pretty sure it's not the oil light, I've got almost 1,000 miles before my next oil change. Can anyone tell me what this is and how to fix it?

Gas or windshield fluid. Or oil or brake fluid. Could be any one of those. AND----by the way--------it CAN be the oil. That light says it's LOW--not that it is DUE for a change.
I would check the windshield wiper fluid first and if it's low, add some washer fluid.