Dates were steeped for the Apostel of Allah (ﷺ) in skin which was tied up at the top and had a mouth. What was steeped in the morning he would drink in the evening and what was steeped in the evening he would drink in the morning.
Sunan Abi Dawud Book 27, Hadith 43
← Previous 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 Next Hadith → Amrah said on the authority of Aisha that she would steep dates for the Messenger of Allah (ﷺ) in the morning. When the evening came, he took his dinner and drank it after his dinner. If anything remained, she poured it out. She then would steep for him at night. When the morning came, he took his morning meal and drank it after his morning meal. She said: The skin vessel was washed in the morning and in the evening. My father (Hayyan) said to her: Twice a day? She said: Yes.

Sunan Abi Dawud Book 27, Hadith 44