This mod will allow you to create a wooden bucket for yourself. It is extremely convenient and simpler than the usual metal bucket. To create, oddly enough, you only need a tree.
Wooden Buckets Mod for Minecraft 1.16.4
You can use the new bucket for anything, be it milk or water. But there is one drawback if you collect lava in a bucket, then immediately catch fire because it is still made of wood.
Download Link: Wooden-Buckets-Mod-1.16.4