Lantern Oil

Lantern Oil is used to fuel the Lantern in Twilight Princess; yellow Chu Jelly has the same effect. Both Lantern Oil and Yellow Chu jelly can be stored in a Empty Bottle. To put Lantern Oil/ Yellow Chu Jelly in the Lantern, equip the bottle of Lantern Oil/Yellow Chu Jelly to one of the D pads. Afterwards, take out the Lantern, and press the D pad in which the bottle of oil/Yellow Chu Jelly was equipted to. Link should then pour the oil/Yellow Chu Jelly into his Lantern, which will fill it up.

Lantern Oil can be purchased at several shops, as well as being found in a few dungeons like Arbiter's Grounds.