اللبن
A staple drink praised as both food and drink, with a specific supplication recommended after drinking it.
مَنْ أَطْعَمَهُ اللَّهُ طَعَامًا فَلْيَقُلْ: اللَّهُمَّ بَارِكْ لَنَا فِيهِ وَأَطْعِمْنَا خَيْرًا مِنْهُ، وَمَنْ سَقَاهُ اللَّهُ لَبَنًا فَلْيَقُلْ: اللَّهُمَّ بَارِكْ لَنَا فِيهِ وَزِدْنَا مِنْهُ
“Whoever is fed food by Allah should say, 'O Allah, bless it for us and feed us better than it'; and whoever is given milk to drink should say, 'O Allah, bless it for us and increase us from it.'” (meaning, not a literal translation)
The Prophet ﷺ is reported to have said nothing suffices as both food and drink except milk (Sunan Abi Dawud 3730).
Ibn al-Qayyim classifies milk as uniquely complete nourishment, gentle on digestion when fresh, and recommends warming it slightly for those with a weak stomach.