Go to the fishing hole, and find the sign that says: No Littering! You can get a bottle if you fish on the left side of the bridge that is near that sign. Its darker water than normal.

To upgrade your wallet size to carry more rupees, you need to catch Golden bugs for Agatha in Hyrule Castle Town.

Give Agatha 1 Golden Bug

Give Agatha all 24 Golden Bugs

Beat "STAR" game lvl. 2 .(Double Clawshot Required)

Beat "STAR" game lvl. 1. (Clawshot Required)

Purchase from Barnes Bomb Shop in Kakariko after 2nd temple.

Free the goron from the giant lava rock located underwater in zoras domain.

Destroy the rock barriers for the River Canoe mini-game owner.

Score 25 points or more on the River Canoe Mini-Game.

Bring back 20 Poe Souls to Jiovani.

Bring back 60 Poe Souls to Jiovani.

After donating 1000 rupees and completing the hot springwater sidequest, donate 2000 more rupees to Malo Mart. A new Malo Mart will open in Castle Town and magic armor will be available for purchase there.

Complete 10 rooms in the Cave of Ordeals

Complete 20 rooms in the Cave of Ordeals

Complete 30 rooms in the Cave of Ordeals

Complete 40 rooms in the Cave of Ordeals

Complete 50 rooms in the Cave of Ordeals

Unlike other Zelda games (where you got attacked if you hit the Cuccos), in Twilight Princess if you hit a Cucco about 8 times, you'll be able to control it for a short period of time.

If you go into the fishing hole behind the sign at the very entrance there will 3 little mounds of dirt.