37 Water Temple small keys

Deku Stick, aqua escape
WESS to Kakariko, Cucco bottle
buy Hylian Shield in Bazaar
DoT skip, Master Sword

savewarp										[Bottle, Bombs, ]
bugs, Pocket Egg, savewarp						[Bottle, Pocket Egg, Bombs]
Ganon's Castle cutscene, bottle on B, wait until day before entering Kakariko
wake up Talon, empty -> Pocket Cucco, trade Pocket Cucco, bugs -> Cojiro
farm 10 bombs, Hookshot, SoT block clip														1b
WESS to LW, pressure jump, trade Cojiro			[Hookshot, Bombs, Cojiro]					2b
enter DC via Goron City, Bomb Bag on Odd Mushroom timer, buy arrows, trade Odd Mushroom		3b
WESS to LW, pressure jump																	2b
bugs -> Odd Potion, bugs -> Bomb Bag (20) | full swipe	[Odd Potion, Bombs, Bomb Bag], trade Odd Potion
empty -> Hookshot, bugs -> Saw					[Hookshot, Bombs, Bottle]	| equip MS, catch bugs in Bottle #1
/Serenade
WESS to grass patches, farm for 2 bomb drops	[Hookshot, Bombs, Bottle]		1b
HESS to GV, cross Gerudo Valley bridge, enter GTG											2b
weirdshot to Ice Arrows																		1b
savewarp
exit, /Serenade, enter Water Temple (teleport SS or ledge clip)

ledge clip to oob water and jumpslash to BK area, use one small key
Longshot, quickdraw bottle on B with Bombs in Longshot room, /SoT, empty -> Bomb Bag (20)	[Longshot, Bombs, Ice Arrows]
vortex room small key, dragon head (whirlpool) small key, savewarp	| equip MS				[Longshot, Bombs, Bottle #3]
Ruto cutscene, lower water level, small key behind bombable wall							[Longshot, Bombs, Ice Arrows]
torches small key, torch clip at the beginning of the corridor, swim up next to entrance
clip back in bounds past the gate, weirdshot to small key behind block, weirdshot to invisible Hookshot collision to get out
shoot arrow to enter central tower, ledge clip, damage boost oob, dive to loading trigger, swim to small key

_ _ _
37 unused keys in total

- skips Goron Tunic, Zora Tunic/Fairy, Iron Boots, Hover Boots, Blue Fire
- doom jump is worth it on Japanese/Chinese; if you get enough rupees to buy a fairy and arrows, you can go for it on other languages as well (needs more timing on different fairies)
- if you don't waste any bombs, 15 will be enough for the whole route (you can get an extra drop from enemies in Water or in Dampe's Grave or cut out damage boosts in Lost Woods, hookshot across GV bridge instead of doing the megaflip, etc.)