Water: Holy Ganges water is readily available at the Ghats.
Black Sesame Seeds (Kala Til): Crucial for Pitru Tarpan.
Kusha Grass (Darbha): Often used to make a ring (Pavitri) worn during the ritual and sometimes placed in the water.
Copper Vessel (Optional): Often used to hold water, though offering directly from cupped hands is common.
(Optional) Rice Grains(Akshat), Barley (Jau): Sometimes used for Deva/Rishi Tarpan or mixed with water.
Yes, black sesame seeds, Kusha grass, and basic vessels are easily available for purchase from vendors near the Ghats in Haridwar.