Grandparents gave me a gallon of mixed grape and plum juice from fruit they picked. They wanted to make room,so just poured several containers of the juice in a gallon jug. Anyway,taste more plum to me. I made up a gallon of the juice with 2 1/2 pounds sugar,a cinammon stick,2 cloves,a pinch of all spice,pinch of nutmeg, nutrient,enegizer,and pectic enzyme. The yeast is Red Star Cote Des Blanc. Not sure what I'll end up with. One question I do have is can I add the unsweetened juice to top the jug off after the fermentation settles down? I left the level a little low expection a wild fermentation start.