Dear All,
here I found a recipe for creating a liquid offering that can be used for tarpaṇa.
Is was published by Haran Aiyā, one of Gurujīs Senior Students and founder of the Rājarajeśvarī Pīṭham in New York, USA.
They are streaming every friday the "Sacred Rites of Sanātana Dharma". All the episodes are available on YouTube and cover indepth explanations of the scientific mechanics related to rituals.
Here is an overwiev of the topics covered so far: https://www.srividya.org/aym-resources/
I hope this is of some use to you.
Lots of love to all!
Śrī Mātre namaḥ, śrī gurubhyo namaḥ
