Sayyiduna Abu Hurayrah (may Allah be pleased with him) said: A Bedouin came to the Prophet (peace and blessings be upon him) and said: We were in the sand, and among us were menstruating women, people in a state of janabah and women in postnatal bleeding. Four months would pass over us in which we found no water. He (peace and blessings be upon him) said: "Hold to the earth," meaning perform tayammum.
(b) In this hadith the narrator al-Muthanna is not strong. (c) Al-Hajjaj bin Artah narrated this report, with a difference only in the chain, namely "from Amr, from his father, from his grandfather". In it the question is about a man who has no water: may he have intercourse with his wife? He (peace and blessings be upon him) said: "Yes."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 1038