Of all the items in The Wind Waker, one of the most useful is bombs. Bombs can be obtained after visiting Greatfish Isle, and it is possible to get to Greatfish isle early, saving time in an Any% speedrun.
After you obtain the grapple hook, you can Item Slide and superswim to Greatfish Isle with relative ease.
Note: In a TAS, it is possible to perform a superswim without item sliding. Because of this, you can get the bombs directly after completing the first visit to Forsaken Fortress.