Borrowing a goat would work. The only time we have lived with a Geurnsey was because we borrowed her in winter to keep us in milk....
I might add, we had to borrow her, because we had a milk customer. He had two pints of milk every second day, and he lived to be 100. His diet? Fish and vegetables, boiled in raw goats milk, and as he got older, puréed! A bit weird, but it worked for him.
Beth