Instructions
Smash any pots in the room you're in; there is a random chance you will find arrows inside of them. If you leave the room and come back to it, the pots will reform, and you will be able to smash them in search of arrows again.
Kill any enemies in the room, as there is a random chance the enemies will drop arrows when you defeat them. Leave the room and come back to it to make some of the enemies reappear, at which point you can kill them for more arrows.
Find the three treasure chests in the temple that contain a bundle of arrows; the chests are inside the room with the checkered floor, the room where you must rotate the wall with the stone lever and the temple's large entryway.