I am afraid it may not be muzza from which(the people of) ‘Abd al-Qais were prohibited. I asked Qatadah : What is muzza’? He replied: Drink of dates made in a green jar and vessels smeared with pitch.
Sunan Abi Dawud Book 27, Hadith 41
← Previous Hadith Safiyyah, daughter of Atiyyah, said: I entered upon Aisha with some women of AbdulQays, and asked her about mixing dried dates and raisins (for drink). She replied: I used to take a handful of dried dates and a handful or raisins and put them in a vessel, and then crush them (and soak in water). Then I would give it to the Prophet (ﷺ) to drink.

Sunan Abi Dawud Book 27, Hadith 40 Next Hadith → We came to the Prophet (ﷺ) and said to him: Messenger of Allah, you know who we are, from where we are and to whom we have come. He said: To Allah and His Apostle. We said: Messenger of Allah, we have grapes; what should we do with them? He said: Make them raisins. We then asked: What should we do with raisins? He replied: Steep them in the morning and drink in the evening, and steep them in the evening and drink in the morning. Steep them in skin vessels and do not steep them in earthen jar, for it it is delayed in pressing, it becomes vinegar.

Sunan Abi Dawud Book 27, Hadith 42