Getting the four bottles
In order:

1.Go to Lon Lon Ranch as young Link during the day. Now go inside
the house and play Talon's cucco game. If you get the three
chickens in the amount of time, you get a bottle with Lon Lon milk in
it. After you drink the milk, you have an empty bottle.
2.Get all of the chickens in to the pen for the chicken lady. One of
them is located in a crate. Two of them can only be reached by
using a chicken to float to them.
3.After you visit Zora's Domain and get the Silver Scale, go to Lake
Hylia and get the bottle with the note in it. After you give it to King
Zora, you will have an empty bottle.
4.As adult Link, ride Epona around until you find Big Poes (ghosts).
You can only find the Big Poes while riding Epona. After you take
each Poe to the guy that buys the Poes from you, he will give you a
bottle.