Thanks Dave & Ray.
I also did a search on this group before posting my question.
Seems like there are lots of options, kind of like seasoning while
cooking.
My question after looking at previous posts centered on the risks and
rewards of different approaches.
After reading your responses and "woodwerks" email I am going to try
frozen unadulterated grape concentrate.
I read some cautions on this choice regarding acidity.
Not quite sure how that impacts taste as this is my first batch.
I will do as you recommend and flavor just a little at a time until I
get the desired taste.
I will then flavor my share, add the potassium sorbate, wait one week,
then bottle (?).