The Book of Drinks
وَحَدَّثَنَا مُحَمَّدُ بْنُ عَبْدِ اللَّهِ بْنِ نُمَيْرٍ، حَدَّثَنَا سُفْيَانُ، عَنْ عَاصِمٍ، عَنِ الشَّعْبِيِّ، عَنِ ابْنِ عَبَّاسٍ، أَنَّ النَّبِيَّ صلى الله عليه وسلم شَرِبَ مِنْ زَمْزَمَ مِنْ دَلْوٍ مِنْهَا وَهُوَ قَائِمٌ .Ibn 'Abbas reported that Allah's Messenger (ﷺ) drank (water) from Zamzam in a bucket while he was standing
From Sahih Muslim, whose reports the scholars accept as authentic.