Which specific substance did Maharaj primarily give to people for healing after he stopped prescribing conventional medicine?

The introductory account in Chapter 0 explains that while Maharaj initially gave out medicine to people free of charge, he later ceased this practice. The text explicitly states that after he stopped giving medicine, Maharaj began to give only Udi, which is sacred ash. The narrative mentions that he had given this ash before as well and that people would benefit from it. This shift from medicine to Udi marks a significant change in his method of helping and healing those who came to him, as confirmed by Maharaj himself in a conversation with the author.