noun
commissary
KAH-mih-sair-ee/ˈkɑːmɪseri/
A place providing food and other supplies for an institution or organized group.
Military families buy groceries at the commissary on the base.

Etymology
A commissary was originally someone entrusted with a duty, later specifically an official responsible for military supplies. The name passed from the supply officer to the store providing food and other goods.
In context
everything else all other food snacks reading material that's all bought off the commissary the canteen and though that slang that's taken from the military right
More examples
- The studio commissary serves lunch to the cast and crew.
- Prisoners can buy soap and snacks at the prison commissary.
- The camp keeps its food supplies in a central commissary.
Forms
commissary · commissaries