Minecraft wiki entry for Brewing_Stand, associated text: Block entity data
Tags common to all block entities[show]
 BrewTime: The number of ticks the potions have to brew.
 CustomName: Optional. The name of this container in JSON text component, which appears in its GUI where the default name ordinarily appears.
 Fuel: Remaining fuel for the brewing stand. 20 when full, and counts down by 1 each time a potion is brewed.
 Items: List of items in this container.
: An item in the brewing stand, including the slot tag:
Slot 0: Left potion slot.
Slot 1: Middle potion slot.
Slot 2: Right potion slot.
Slot 3: Where the potion ingredient goes.
Slot 4: Fuel (Blaze Powder).
Tags common to all items[show]
 Lock: Optional. When not blank, prevents the container from being opened unless the opener is holding an item whose name matches this string.