Can you explain the story of how Sai Baba lit lamps without oil?

According to the narrative in Chapter 5, Sai Baba had a great fondness for lighting lamps and would collect oil from local shopkeepers daily. However, the grocers conspired to stop this 'nuisance' and refused to give him any oil. In response, Baba performed a miracle. He took a tin pot with a tiny bit of remaining oil, poured water into it, and drank it as an offering. He then filled the lamps with plain water, soaked the wicks, and lit them. Astonishingly, the lamps burned all night long, a testament to Baba's power that left the repentant grocers in awe.