Go to the shop run by a bird near the Forest Temple. Use a bottle to take some oil but don’t pay when he asks you to. The next time you return he will call you a thief and start pecking you. Quickly take more items while he’s pecking you. Note: His pecks only take a quarter of a heart away.
Take an empty bottle to the shop near the Forest Temple that’s run by a bird. Grab as much Red Potion or Lantern Oil as you want and only pay 1 rupee when he asks you to pay. The bird will them say that you’re really cheap but won’t attack you.
Kill a Yellow Chu and then scoop it up with your lantern to fill it completely with oil.