Could you explain the advice from the saint Janakidas Baba (Sai Baba) for Kashiram to feed sugar to ants?

Your question appears to conflate two different holy figures mentioned in the text. While Kashiram was a devotee of Sai Baba, who is referred to as Maharaj, it was a different saint named Janakidas Baba who gave the advice to feed sugar to ants. As Chapter 0 explains, Kashiram took this counsel from Janakidas Baba to heart. He constantly carried a bundle of powdered sugar specifically for this purpose. The practice became so important to him that he was willing to risk his life to protect this bundle from robbers, viewing the act of feeding ants as a profound duty.