I hate it when an orange ! pops up on my screen as it makes you think something is going to fail and you'll be left stranded and die on the side of the road when in fact the windscreen washer bottle is getting empty. Why don't the designers just put a message on the screen and tell you straight out what's wrong?
As others have said, use the right button on the steering wheel to find the "Show Warnings" function... and then fill up your washer bottle!

