Is there a simple way to practise fire worship more suited to modern times and not too complex and time-taking?
This is directly the procedure. There are other requirements of ritual purity for individual , apparel, ( bath) , cleanliness , events around ( death) and dates. Preliminary mantras. Will post on that later as another question.
Agnihotra: Havan kund, cowdung cakes, whole rice akshat, ghee.( evacuate smoke/ fire alarm, and fire sprinkler off/ on)
A unauthenticated procedure of Agnihotra (is quoted as it is simple) from Sanatan Santha Foundation writingslink traced by principal moderator
- Direction : Sit facing the east
- Method of kindling the fire Keep a small, flat piece of cowdung cake at the bottom of the vessel, and above it arrange cowdung cakes smeared with ghee in such a manner (2-3 layers of vertically and horizontally arranged cowdung cakes) that there is free flow of air within the spaces. Then, take a piece of cowdung cake, apply a little ghee to it and after kindling it, keep it in the Agnihotra vessel. After some time, all the cowdung cakes will start burning. For kindling the fire, you can use a hand-held fan. However, never blow air from the mouth; else, germs from the mouth will enter the fire. Do not use inflammable substances such as kerosene to kindle the fire, since the fire should remain smokeless.
2B. Mantras to be recited At sunrise : 1. Sooryaya swáahá, Sooryáya idam na mama; 2. Prajápataye swáahá, Prajápatay idam na mama
सूर्याय स्वाहा, सूर्याय इदं न मम । प्रजापतये स्वाहा, प्रजापतय इदं न मम
At sunset : 1. Agnaye swaáhá, Agnay idam na mama; 2. Prajápataye swáahá, Prajápatay idam na mama
अग्नये स्वाहा, अग्नय इदं न मम । प्रजापतये स्वाहा, प्रजापतय इदं न मम ॥
2C. Offering the oblation ingredients to Agni Take two pinches of rice grains on your palm or in a copper plate and add a few drops of cow’s ghee to it. Precisely at sunrise / sunset, recite the first mantra once and take the mixture of rice grains and ghee in the pinch (made by joining the middle finger, ring finger and thumb of the right hand). Offer the mixed ingredients (Rice grains sufficient to fill a pinch) to Agni while pronouncing ‘swáahá’. Again, offer the mixture of rice and ghee to Agni with the right hand when reciting the second mantra once while pronouncing the word ‘swáahá’. Benefits : this is yaagam, effort.
Arya samaj procedure link is given as actual procedure too long to quote here: https://davchennai.org/wp-content/uploads/2021/04/%E2%80%A6