Decanting golems carry around Warded Jars and Marshmallows.
You have discovered how to create decanting golems . They each carry around a warded jar that allows it to transport all known liquids including essentia, each jar is big enough to carry 64 essentia or 4 buckets of other liquids.
When placed on the side of an alembic they will function like normal tallow golems. but without having the waste of a chest full of phials.
When placed on something capable of holding a liquid, they will attempt to fill it with an appropiate liquid from any of the available marked sources. You can also specify specific liquids that they should fetch.