For Agnihotra you require a copper pyramid of specific size. Copper is a conductor for subtle energies also.
Brown rice. Highly polished rice loses nutritional value and hence low polished rice. Only unbroken pieces of rice should be used for Agnihotra. If rice is broken the subtle energy structure around the material is disturbed and hence is not fit for Agnihotra healing fire.
GHEE (clarified butter):
Take some butter from cow's milk, which has no additives and is pure. Heat it on low heat. After the water has evaporated and white solids have risen to the top pass the liquid through a fine strainer. What passes through is clarified butter (Ghee). This can last without refrigeration for a long time. Ghee is a very special medicinal substance. When used in Agnihotra fire it acts as a carrier agent for subtle energies. Powerful energy is locked up in this material.
DRIED COW DUNG:
Take dung from male or female progeny of a cow. Make pancake-like patties and dry them in sun. Agnihotra fire is to be prepared from this dried cow dung.
Cow dung is treated as medicine in all ancient cultures whether they be Indians of North or South America, Scandinavians, East or West Europeans, Africans or Asians.
The cow dung, Ghee (clarified butter from cow's milk) and rice then interact to form a composition, which is thrust, surrounds, neutralises and nutritionalises the material. Then, with organic substances, this provides the nutrients for survival, yield and propagation. This is how the Agnihotra fire physically heals the atmosphere.