Well water and water sources were often contaminated in Medieval Europe, so European peoples would turn their water into a low alcohol content ale or beer to make their water safer. Since alcohol was forbidden in Islam, what did peoples of the Islamic regions do to purify their water sources if at all?
Hey there! Not to preclude further discussion, but the premise that people drank alcoholic beverages in order to make water safer is a myth, which is going to be a serious obstacle for your question. You may find the linked answer by /u/sunagainstgold to be helpful!