Pour the sour milk into a container with a lid.,
Place the container in a warm and sunny spot.,
Wait a few days.
Put the lid over the milk to help generate heat and to cover the odor.;
, If you can deal with any odors, place it indoors. If not, put it somewhere outside where it cannot be attacked by vermin.
, When the milk has solidified and become crumbly (about 3-4 days), it is ready to become chicken feed. Crumble it loosely and share with the hens! If preferred, place it into a feeding container of some sort to prevent it mingling with soil.