Connecting to the network does not have to mean connecting to the internet. Basically every consumer grade router out there is capable of restricting a device to the local network only. It could reach other devices on the network and the other devices would be able to reach it, but it would still be cut off from the internet.
Good butter straight from a dairy farm is super dangerous though. You can suddenly find yourself standing in your kitchen, no memory of the last 45 minutes, the fridge door open, a greasy knife in your hand, breadcrumbs all over the floor, and half the butter gone. Gotta be careful with that stuff.