Shama-il Tirmidhi Chapter 31, Hadith Number 9 (205).

Sayyidina Anas radiyallahu anhu reports, Rasoolullah sallallahu alaihe wasallam went to my mother, Umme Sulaim’s house. A leather water bag was hanging there. Rasoolullah sallallahu alaihe wasallam stood and drank water from it. Umme Sulaim radiyallahu anha stood up and cut off that portion of the bag.

The same type of incident of Sayyidatina Kabshah radiyallahu anha has been related in another hadith. It is however difficult to sit and drink from a water bag which is hanging. These are things that are done in times of necessity. A few ahaadith reported on the incident of Sayyidatina Umme Sulaim radiyallahu anha that she said, while cutting off the mouth piece of the water bag from which Sayyidina Rasoolullah sallallahu alaihe wasallam had drank, No one shall put their mouth on it and drink from it again. We understand from this that she did it out of love and respect for Sayyidina Rasoolullah sallallahu alaihe wasallam.