There is no kafarrah because it was a voluntary fast. You may fast on Friday alone as this is not for the sake of Friday but rather for the sake of Thul Hijjah.

I intended to fast on Friday with the intention of Dhul Hijjah Fast but after Salatul Jumaah I realised its is not permissible to fast on Friday, so I discontinued my fast. Do I have to do the kaffara?And what will be the kaffara for this fast? And if I had continued is it that I would have to fast on saturday as well?

Fasting | December 13, 2014 2:19 pm
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What is the ruling for Fasting on the Day of Arfaat, is it according to Saudi Arabia throughout the world or they have to fast according to their dates. As when we have 9th Dhul Hajj in Saudi Arabia, but in India it is 8th dhul Hajj so when will they have to Fast?
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When I fast on Mondays, is it permissible to have a cup of water and pray magrib prayer thereafter have food as there is an narrow gap between Adhaan and iqama or to have food then pray? Which is recommended?