Cheese may be the best way to store milk.
Agreed. Cheese has to be considered as one of mankind's greatest inventions.
Also, butter.
Take a surplus of milk in the springtime, and convert it into butter.
Then, later the surplus can be converted into a long storing cheese.
Before butter and cheese were 'discovered', owning a cow was not considered a good investment for most. Now, it is a practical way to convert grass into high quality protein and nutrition.