Can you tell me the story of how Sai Baba lit lamps with water after the shopkeepers refused him oil?

According to Chapter 5, Sai Baba had a great love for lighting lamps and would beg for oil daily from local shopkeepers. Annoyed by this, the grocers conspired to refuse him. After they all said no, Baba returned to the mosque with his tin pot, which had only a tiny bit of oil. He poured water into it, drank it as an offering to the Supreme, and then filled the lamps with plain water. He lit the wicks, and to the shopkeepers' amazement, the lamps burned brightly all night using only water, demonstrating his divine power.