(111) Chapter: Etiquette of Drinking Water

Ibn 'Abbas (May Allah be pleased with them) reported:
Messenger of Allah (ﷺ) said, "Do not drink in one gulp like a camel, but in two or three (gulps). Mention the Name of Allah (i.e., say Bismillah) when you start drinking and praise Him (i.e., say Al-hamdu lillah) after you have finished (drinking)."

[At- Tirmidhi].

Commentary: This Hadith, too, prohibits us from drinking water in a single breath. It is preferable to say Bismillah every time we drink, and Al-hamdu lillah every time we stop drinking.