Based on the provided text, describe the process Sai Baba followed to create the Udi he distributed.

According to the narration in Chapter 33, the creation of Udi was a deliberate and continuous process. Sai Baba would first acquire firewood, sometimes by purchasing bundles from those who had a surplus. He would then pile these heaps of dry logs and offer them into the sacred Dhuni, a fire that he kept constantly burning in the Masjid. The ash that remained in great quantity from this sacred fire was the Udi. Baba would then collect this ash and apply it to his devotees, making it a central part of his daily interactions and teachings.