Key materials include rice flour, barley (jau) flour, black sesame seeds (til), honey, milk, ghee, Kusha grass (darbha), flowers, and water from the Alaknanda. Pandits at Brahmakapal usually arrange the necessary Samagri as part of their service. If you have specific family requirements, discuss them with the Pandit beforehand. Basic materials are easily available in the Badrinath market if needed.