Why does something so ordinary and commonplace as giving water to a wayfarer become so significant to Prakriti?

The wayfarer in the play is the most revered disciple of Buddha. His name is Ananda. Prakriti compares the water with enormous ocean of humanity with which Ananda treats her as a Human being. All her life Prakriti has been told that she is a chandalika, a low untouchable caste, whereas the monk makes no such distinction between himself and Prakriti and seeks water from her.