These bathroom passes can be used in many different ways. They are 2 sets per page to save paper. 9 passes per set, each with a different restroom/water fact.
I give these out to my students every quarter (so it averages to about 1 pass per week). I will either stamp or initial when a student wants to leave. They could also be cut out and handed in by the students. I allow my students to "roll over" unused passes for the next quarter or for extra credit.