1. Sunnah Of Drinking

1. To sit and drink. (Sahih al-Bukhari Hadith 6452 and Sahih Muslim Hadith 5242, 5247). 

Zamzam water and left over water in the utensil used for Wudhu are excluded from this.

2. To drink with the right hand. 
(Sahih al-Bukhari Hadith 5380; Sahih Muslim Hadith 5233)

3. To take 3 sips (or more in odd numbers). (
Sahih al-Bukhari Hadith 5631; Sahih Muslim Hadith 5255)

4. To say Bismillah before drinking. 
(Sahih al-Bukhari and al-Azkaar; Fath al-Baari vol.10 pg.117)

5. To say Alhamdulillah after drinking. 
(Ibnus-sunni Hadith 472; Majmauz-zawaaid vol.5 pg.81; Sunan al-Tirmidhi Hadith 1885; Fath al-Bari vol.10 pg.117 Hadith 5631)

6. If there are several people who are going to share the drink, it should be given to the one on the right. 
(Sahih al-Bukhari Hadith 5612; Sahih Muslim Hadith 5257)

7. The one who is distributing the water (or food) should himself drink after everyone. 
(Sunan al-Tirmidhi Hadith 894)

8. To recite the following Du’aa after drinking,
 ‘Alhamdulillaahi llaadhiy at’ama wa saqaa, wa sawwaghahu wa ja’ala lahu makhraja.' 
(Abu Dawud Hadith 3847). 
This Du’aa could also be recited after eating. (Ibid)

9. After drinking milk to recite 
‘Allaahumma baarik lanaa feehi wa zidnaa minhu’.
 (Sunan Abi Dawud Hadith 3723; Sunan al-Tirmidhi Hadith 3455; ibnus-sunni Hadith 474).