Question:
Follow-up question to “diluting grape juice” – As I indicated in my original question, I had a safek if I was yotzi (though my feeling is that the Kiddush was no good or at least questionable). If I would proceed to make Kiddush on the challos, it would be a safek bracha l’vatala, since possibly I was already yotzi.
Answer:
So don’t make kiddush on the challas!
Sources: