According to another comment this product is pure 1-(perfluorohexyl)octane [1]. There's no practical way to make it at home, but it can be had for $980-$750/kg from an industrial supplier, depending on how many kilograms you commit to buy at once:

https://www.chemicalbook.com/ProductDetail_EN_1-perfluorohex...

Add analytical lab services to analyze it for purity and you could still get a lifetime supply for the price of a couple of brand-name bottles. This is the sort of thing that some Americans have been doing to get cheap GLP-1 peptide drugs from overseas too.

[1] https://en.wikipedia.org/wiki/Perfluorohexyloctane