The Prophet (peace be upon him) said: "Do not drink water in one gulp (or one breath) like a camel, but take it in two or three instalments (with break for breaths); take the name of Allah (i.e. recite Bismillah) when you start drinking and praise Him (say Alhamdulillah) when you finish." (Tirmidhi Hadith 758) Narrated by Abdullah ibn Abbas.