Instructions
Play through the game until you reach gardener skill level five. Go to Gretchen Fetchem's shop and purchase a Moozipan for 2,800 chocolate coins. The Moozipan will automatically appear in your garden.
Go to Willy Builder and purchase a Milking Shed for 616 chocolate coins. The Milking Shed will then appear in your garden.
Direct the Moozipan to a sunflower, and he will eat it. If you don't have any sunflowers in your garden, purchase a sunflower seed from Costolot's General Store and plant it in your garden. A milk bottle icon will appear over the Moozipan after it has eaten the sunflower.
Direct the Moozipan to the Milking Shed. The shed will shake for a few seconds, and then it will spit out a bottle of milk. The Moozipan will leave the shed a few seconds later. Feed the Moozipan a sunflower and send it back to the Milking Shed every time you want more milk.