The most important thing is always a heart full of faith (shraddha) and respect. Materially, for Pind Daan in Prayagraj, you primarily need yourselves, dressed in clean, simple clothes (preferably traditional wear like dhoti/kurta for men, saree/suit for women, avoiding black).
If you are performing rites for a recent demise, bring the details like the departed’s name, gotra, and date/tithi of death. Most puja samagri (ritual items) like rice, barley flour, sesame seeds, kusha grass, flowers, etc., can be arranged locally here in Prayagraj, often by the Pandit you engage.
However, carrying a small container of black sesame seeds (til) from home is sometimes done. Just come prepared mentally and spiritually for this important task in Prayagraj.