Instructions
Talk to Talon when you first arrive at the Lon Lon Ranch and pay him 10 rupees to play the Super Cucco minigame.
Run around the room, picking up cuccos until you find all three Super Cuccos. The Super Cuccos look just like normal cuccos, so the best strategy is to try and pick up as many as possible, as fast as possible.
Win the Super Cucco minigame to obtain a bottle of Lon Lon Milk. To drink the milk, open your item menu and set it to one of your item buttons. Return to the game and press the corresponding item button to drink the Lon Lon Milk.
Talk to Talon again to fill any empty bottle with Lon Lon Milk for 10 rupees.
Talk to Malon at the Lon Lon Ranch to learn how to play Epona's Song on your ocarina. Follow the onscreen instructions and press the corresponding buttons to learn the song.
Play Epona's Song next to any Lon Lon while carrying an empty bottle to receive a free refill of Lon Lon Milk.