Reference: http://mufti.af.org.sa/ar/content/حكم-استعمال-ماء-زمزم-في-الطبخ-أو-الإغتسال-من-الجنابة
Question: Is it permissible to use Zam Zam water for cooking or bathing in following a major ritual impurity (janaabah)?
Response: [Zam Zam] water is respected; it is [to be used] for drinking and wudhoo in general. As for using it to bathe in following a major ritual impurity and the like, then this is not befitting. [Zam Zam] is water that is highly respected, and should be used for drinking, and it is best that it not be used to bathe in following a major ritual impurity and the like.
