Feel dumb for askin but one of the idiot lights popped up on my tach. Its the square with water on the bottom and an arrow pointing down. Whats it mean? Whats low?

 

could be your windshield washer fluid is low...

 

That is the low coolant light. Check the coolant and if its not low, most likely the sensor went bad. A common accurance. The sensor is on the top passenger side of the radiator. If you unplug it, the light will go out or you can replace it like I did.