Quality & Sealing

Quality
Finished drinks come out bad, normal, or good (shown as a star rating). Quality depends on how precisely you matched the recipe at every step:
How long it fermented in the cauldron
Number of distill runs
Barrel wood type
Years aged
Each recipe also has a difficulty — high-difficulty drinks like absinthe or whiskey demand tight precision, while a simple beer is forgiving.
A finished brew label shows its name, quality stars, an alcohol indicator, and "Brewed by " — so a perfectly-aged spirit always carries the name of whoever made it.
Sealing
Sealing locks a brew in its current state. It is the tool for shops, trades and gifts — a sealed brew:
Becomes static — it stops aging and will never change again, so a perfect brew stays perfect forever.
Stacks with other identical sealed brews, making it tidy to store and sell.
Hides its exact alcohol % (it still shows "Alcoholic", just not the number).
The Brew Sealing Table
Sealing is done at a Brew Sealing Table — a block you craft yourself. It is its own separate item, not a normal smoker, so your ordinary smokers keep working for cooking as usual.
Craft it with 2 glass bottles over 4 wood planks (any wood):
Bottle  Bottle
Plank   Plank
Plank   Plank
Place it down and right-click it to open the sealer, then drop your brews in — they come out sealed.
Only seal a brew once you are happy with it — sealing is permanent and stops it aging any further.