Will Guide

I've been trying to do a playthrough of Majora's Mask where I try to avoid collecting any but the required mask. And also avoiding picking up Heart pieces that have to do with the Bombers notebook; any Heart Pieces that are found out in the open I can grab them. I've been doing so well until the second to last boss. Without a bigger magic meter or being allowed to go into the Milk Bar to get that milk that gets you unlimited magic for a cycle I keep running out of magic to use the Giant's Mask.  Also since I'm using the weakest sword it takes many more hits to finally destroy the boss. Not sure if I can go any further