Lon Lon Milk

Lon Lon Milk is a recurring item in the Legend of Zelda series. Lon Lon Milk is a delicious drink with nutritious healing properties produced by Lon Lon Ranch cows. If Epona's Song is played to a cow, it will provide Link with a free bottle of Lon Lon Milk, as long as he has an Empty Bottle.

The Legend of Zelda: Ocarina of Time
When Link completes Talon's Super Cucco Game, he's given a bottle full of Lon Lon Milk. Refills can be purchased for 10 Rupees.

The Legend of Zelda: Majora's Mask
Link is given a bottle full of Milk by Romani after guarding the barn from the alien invaders. Refills can be at the Milk Bar for 20 Rupees. There also exists another type of milk called Chateau Romani with magical properties.

The Legend of Zelda: The Minish Cap
In The Minish Cap, Malon sells Lon Lon Milk in Hyrule Town for 100 Rupees, after Link unlocks the ranch door.