I spend considerable time inside the Musjid reading Qur'aan Shareef.

Question

I spend considerable time inside the Musjid reading Qur'aan Shareef. Children here (in Karachi) play cricket outside the Musjid. Sometime the ball is hit into the Musjid. These children enter the Musjid to drink water from the cooler. They do not perform Salaat. They continue playing cricket while the Athaan is recited, and throughout the duration of Jamaat Salaat. Other faasiqs also drink water from the Musjid's cooler. I feel uneasy drinking from the same cups/glasses from which these children and other flagrantly disobedient people drink. What is your advice?