Based on the provided text, what are the different ways one can use Sai Baba's Udi?

Chapter 33 illustrates several methods for using Sai Baba's sacred Udi to receive his grace and blessings. It can be applied externally, as the text recommends daily application after bathing and as Baba himself did when he applied Udi to a sick child. It can also be consumed, with the text mentioning that drinking it with holy water brings purification and that taking it orally helped a man overcome insomnia. Finally, it can be kept as a protective charm. The chapter describes a devotee reverently placing what Baba had given him into a Tait-amulet, which was then tied to his wrist.