"The Prophet became thirsty around the Ka'bah so he called for a drink. Some Nabidh was brought in a water skin and he smelled it and frowned. He said: 'Bring me a bucket of Zamzam (water).' He poured it over it and drank some. A man said: 'Is it unlawful, O Messenger of Allah?' He said: 'No.'"
Sunan an-Nasa'i Book 51, Hadith 165