Was caught with a coffee cup at work, the next day everyone’s “water privileges” were revoked.

Worked as a cashier at AC Moore. I had a coffee cup under the register and I would drink from it when there was no costumers in line or in view. My boss found this cup, grabbed it, said “no, absolutely not”, and took it to the break room. Next day there was a passive aggressive letter posted in the office saying that “some employee” abused the “water privilege” and now no one is allowed to have water at the cash register.