When the Usage of Water Endangers One's life or his Companions'
Issue No.628- If a person has enough water, but fears that if he uses it for wuḍū or ghusl, he, his children or his friends and companions will suffer an acute thirst which may result in their illness or death, or it may cause intolerable hardship, he should perform tayammum and keep the water. Also, if a non-Muslim’s life is in danger, he should give the water to him and perform tayammum. The ruling applies to animals too.
