A man in open desert who breaks his ablution

Sayyiduna Ali (may Allah be pleased with him) said: When a man becomes junub in a desert and he has only a very little water, he should give his own life priority over the water and perform tayammum with earth.

Ata and Tawus said: When you are on a journey and you have only a little water, perform tayammum and save the water.

Sayyiduna Ibn Abbas (may Allah be pleased with them both) said: When you become junub while travelling, or your ablution is broken, and you fear that if you perform ablution you will die of thirst, then do not perform ablution; keep the water for yourself.

The same is also reported from Sa'id bin Jubayr.