AS-SAQQAA
During the battle of at-Taff and the few days preceding, Ubaidullah ibn Ziyad; the governor of Kufa, imposed a blockade on the sources of water so as to prevent Imam al-Hussein (a), his household, and army from having water. , al-Abbas, undertook the mission of fetching water to the camp and harem of his brother. He pushed himself among the large gatherings of that army and could reach the River Euphrates several times. On that account, he had the epithet 'as-Saqqaa -the provider of water.'
AL-ABBAS AND WATERING
From his forefathers, al-Abbas inherited the mission of serving water. Other than the other Koreishite clans, the Hashemites exclusively undertook the mission of serving water for the unparalleled qualities of generosity, munificence, and honor that they enjoyed.
Historians have recorded that Qussay ibn Kelab was the foremost to serve water to the pilgrims of the Sacred House of God in Mecca. After him, his son Abd-Menaf inherited this mission and left it to his son Hashim who, too, left it to his son Abd-ul-Muttalib. The latter undertook this mission so perfectly that God conferred upon him with the bliss of the Well Zamzam. After Abd-ul-Muttalib, Abu-Talib undertook this mission then handed it over to his brother al-Abbas ibn Abd-ul-Muttalib.
On the day of the conquest of Mecca, al-Abbas offered this mission to the Prophet (s) who gave it back to him.
Furthermore, history is full of narrations mentioning that the Prophet (s) served water to his companions in many occasions before and after prophesy.
Imam Ali Amir ul-Muminin, also, served the Muslim army with water at that night before the day of the Battle of Badr. On the day of the Hudaibiya Treaty, Imam Ali served the Prophet and Muslims with water.
When Uthman ibn Affan was blockaded at his house, Imam Ali ordered his sons to send him water.