Half Birdie’s family are brewers, she grew up in a tavern, has been sneaking drinks she was like fourteen, and is just a brick shithouse of a woman. Add in the metabolism of a warden and she can go toe to toe with the best of them drinking-wise.
Cosima does not drink, she hates the idea of being drunk. It’s too close to being sedated. This does not stop her from partaking in hallucinogenic substances like deathroot vapors or mushrooms. Thats different, that’s just poison.
Frauke is a lightweight and simply turns Bright Red face to chest the longer she drinks.