In circumstances when water cannot be found, or just enough is available for drinking, or it is injurious to health: in such situations Tayammum (dry ablution) can be performed.
The procedure below is given according to Qur'an and Hadith. ". . . And if you don't find any water, then take clean earth (or sand) and rub it on your face, and hands. Allah does not wish to put you in a difficulty, bet he wants to make you clean, and complete His favour unto you, so you should be grateful to Him." (Surah V. verse 6). (The permission to use sand for this purpose is allowed in the Qur'an).
Here is the complete sixth verse of Surah V (Al-Maaida),
The procedure below is given according to Qur'an and Hadith. ". . . And if you don't find any water, then take clean earth (or sand) and rub it on your face, and hands. Allah does not wish to put you in a difficulty, bet he wants to make you clean, and complete His favour unto you, so you should be grateful to Him." (Surah V. verse 6). (The permission to use sand for this purpose is allowed in the Qur'an).
Here is the complete sixth verse of Surah V (Al-Maaida),