Abu Sa'id Al-Khudri (May Allah be pleased with him) reported:
Messenger of Allah (ﷺ) forbade turning the water-skin upside down and drinking directly from its mouth.[Al-Bukhari and Muslim]. (AR)
App reference (AR): Book 3, Hadith 35 (AR)
Arabic/English book reference (AR): Book 3, Hadith 762 (AR)