Abu al-Muthanna said: I was with Marwan when Sayyiduna Abu Sa'id (may Allah be pleased with him) came and narrated that a man said: O Messenger of Allah! I do not become satisfied in one breath? The Prophet (peace be upon him) said: "Then remove the cup from your mouth and then take a breath." He asked: What if I see something dirty in it? He said: "Pour it out."
Hadith Referenceسنن دارمي / من كتاب الاشربة / 2158
Hadith Takhrijاس روایت کی سند صحیح ہے۔ دیکھئے: [ترمذي 1887] ، [ابن حبان 5327] ، [الموارد 1367] ، [أحمد 57/3] ، [بغوي فى شرح السنة 3036]
Brief Explanation
(Commentary on Hadith 2157)
Apparently, from this hadith it is understood that one may drink water in a single breath, and also that when taking a breath, the vessel should be moved away from the mouth.