Item Upgrades
Quiver upgrades are gotten by getting a perfect score at shooting gallery. These shooting galleries are in clock town and in the swamp. To get the big bomb bag, you need to save the old lady on the first night and on the second day she will carry the big bomb bag in the bomb shop. The biggest bomb bag is gotten by talking to deku in the goron village and giving him your big bomb bag and 200 rupees. Now to get your sword powered you will need 200 rupees, you will also to have defeated Goht and it has to be the 1st day. So after defeating Goht go into the house in mountain village and till to power up your sword for 100 rupees. Now go use a powder keg to blow up the entrance to the racetrack, in their race as Goron Link and you need to win first place as it will give you gold dust (and a bottle). Now on the dawn of second day go back the house in the mountain as give them another 100 rupees and the gold dust. Just wait another day and you will have the 3rd best sword in the game! It will also never break unlike the previous sword upgrade.
Now on to wallets, to get the adult wallet that holds 200 rupees, just give the bank 200 rupees. To get the giant's wallet that holds 500 rupees complete the Oceanside Spider House on the first day.