If you catch hot spring water in a bottle from Bottle Duplication, you can overwrite some of the memory addresses in the game. Unlike Ocarina of Time, the addresses that can be changed are mostly useless. Regardless, it still has some interesting effects. Some of the effects include jinxing yourself, gaining 256 rupees, getting stuck on one day, and pulling a rock sirloin out of thin air.
Simply duplicate a bottle over any item slot (Ocarina of Time through Fierce Deity Mask), then catch hot spring water in it. Instead of programming each slot's timer individually, the game does math depending on which slot the hot spring water is caught in. So thanks to bottle duplication, we can now write to memory addresses that are near the normal hot spring water timers. Here is an example of what happens when you catch hot spring water in a bottle that's in the Ocarina of Time slot.
Hot Spring Water timers write a total of 33 bytes, in 4 rows(24 bytes) and one lone 01 byte. Each slot moves the 3 rows by 8 bytes, while the lone 01 byte moves by one. The first row writes the value of the 8 byte global timer, so they can be manipulated easily. The second and third row are always the same, 00 00 00 00 70 17 00 00. The fourth row is always 8 bytes of 00's. The 01 byte also remains the same.
For in-depth Bottle Adventure documentation, go here: Bottle Adventure Documentation
Here are some of the effects you can get from each slot.
(US/PAL)
Lens of Truth: Short Jinx timer.
Hookshot: Randomly disables pause (is re-enabled after either the end of the death cutscene or a day or night transition that stops the game), randomly disables C-buttons (they're re-enabled after leaving the scene), randomly changes instruments to sound like deku trumpets, can cause you to get stuck on the same day, a 1 frame jinx timer, and false eggs appear in Marine Lab. May cause the Boat Archery minigame to happen instead of a regular Boat Cruise, even without beating Woodfall Temple, allowing you to receive the Piece of Heart afterwards even if no targets were hit. That's the best case scenario however, as it depends on a random number that is determined at the moment the Hot Spring Water is scooped. During a test where HSW was scooped at 20 different moments over the Hookshot slot, there was a 40% success rate. 10 of them resulted in a regular Boat Ride (without archery, as if the glitch didn't happen), 2 of them resulted in Archery that auto-fails due to supposedly shooting Koume 10 times, 2 of them resulted in Archery that auto-wins the Piece of Heart, even with 0 targets shot, while 6 of them resulted in a "regular" Boat Archery minigame. The best case scenario is demonstrated on Seedborn's video.
Great Fairy Sword: Gain 256 rupees, random jinx timer(usually extremely long), and rock sirloin when you load a new map.
(JP)