https://en.wikipedia.org/wiki/Litter_boxes_in_schools_hoax?wprov=sfla1

The only known official instance of cat litter being placed in school classrooms for potential use by students was in the late 2010s by the Jefferson County Public School District in Colorado, where the 1999 Columbine High School massacre took place. Some teachers were given "go buckets" that contained cat litter to be used as a toilet in an emergency lockdown situation, such as during a school shooting.

moral panics always have a core of truth in them maybe watch the video it's really good, adresses the satanist panic etc.

Here is a video that went viral of a teacher explaianing the "bathroom bucket" https://www.youtube.com/watch?v=fEEP2PfxYSQ If you search for a "Classroom Lockdown Bucket" you will get numerous results of websites selling a bucket filled with emergency supplies that can also be used as a toilet.