As the original ticket https://mcreator.net/tracker/issue/51048 diverged from just brewing recipes and other features requested in this ticket were added, I am making this ticket to cover brewing recipes feature support.
This ticket includes support for use of potions as items in other recipe types too.
Issue comments
Migrated to https://github.com/MCreator/MCreator/issues/68
Yes, I did see that you can get the potions in the block procedures. Our fix was to create a custom potion effect, then create a item with food properties and set the animation to "drinking". Then applied the trigger where when the player finished using the item, it applied our potion effect. Which seems to work.
But there was not any way as far as I could see, too simply add a vanilla potion to a simple crafting recipe as an input or output.
we.need.this.