Question
A person who has become impure has run out of water in his house, is it permissible for him to perform tayammum?
Answer
I say, and with God's help: He must seek water from others and search for it; if he does not find it, he is permitted to perform tayammum. See: Al-Bahr Al-Ra'iq 1: 160, Al-Radd Al-Muhtar 1: 170, Sharh Al-Wiqayah p. 110, Al-Hadiyyah Al-Alaiyyah p. 38, and Sharh Al-Ziyadat vol. 3/a, and God knows best.