This is brilliant trying it now

Makes sense. Great work on the mod.

Jugs have a capacity of 15 units, but it's never utilized. The most liquid that vanilla places in a jug is 5 units of olive oil, and that requires a high level herbalist to obtain a stack of 5 olives (quite rare). Everything else that uses jugs (honey, royal jelly, and all other oil pressing reactions) only create 1 unit of liquid in the jug.

The reactions aren't intended to always create full containers anyways, they're options for mods to utilize various quantities of water easily. A small scale reaction can use a jug, a medium scale reaction can use a bucket, and a large scale reaction can use a barrel. Reactions have a lot of issues with liquid reagents, so it's safer to be able to specify the container type as a method of determining the quantity of liquid called for.

Large pots are already accounted for in the barrel reaction.

Jugs should hold more water. They hold 15 units of liquid in other circumstances, flasks and water skins hold three units of drinkable liquid. There's also a Large Pot item that's comparable to a barrel.

@CondoR The workshop can be built and work without any access to water. There's currently not a function in the game for water like there is for magma-fueled workshops. Vanilla only uses water in buckets for two things: filling ponds and hospital drinking. I know the water from this can't be used for filling ponds, because that job is programmed to start with an empty bucket. I don't know if this can be used for providing water to a hospital. Water in jugs and barrels isn't possible in vanilla.

Finally, I can mod in my fantasy of the ultimate bucket brigade

Can this well be used on maps with no water sources at all? Is water filled into barrels, jugs, buckets used like vanilla?