Blue Water Cruiser How Do You Get Blue Water Out Of The Toilet Bowl?

How do you get blue water out of the toilet bowl? - blue water cruiser

I moved into a condo and the previous owner to store things in the toilet tank to blue water. I climbed into the tank to see if it's is a distributor, but found nothing. I think I poured into the tank. How can I get rid of the blue? The flushing will not disappear.