What was the specific ritual Baba performed with the water and oil before lighting the lamps?

Chapter 5 describes the specific actions Sai Baba took after the shopkeepers refused him oil. He did not simply pour water into the lamps. First, he picked up his tin pot, which contained a tiny bit of oil. He then poured water into that pot with the remaining oil and drank the mixture himself, making it an offering to Brahman, the Supreme Being. After performing this sacred act, he took plain water, poured that into the lamps to soak the dry wicks, and then lit them with a match, demonstrating the miracle of water burning like oil.