Kalina should take medicine, antitoxin, ice...
The others should also distribute items among themselves so that at least 1 person takes healing potions (it's better not to put everything in one slot, but distribute them) and other medicine in the other slots (useful medicine in battle is bandages, ice, antitoxin, sedative(?), and potions; the rest probably don't make much sense to keep in a quick slot).
Those with low damage should take pestles in a quick slot or weapons (this applies to Kiliku, for example, although Kalina might also find it useful to keep a pestle with 1 bullet in another slot instead of antitoxin/ice, at her discretion).