make sure its 100% juice no high fructose corn syrup, i have a gallon fining now i used a gallon of white grape juice not wlechs but another one tht worked from giant, and a bag of frozen peaches and a bag of frozen mangoes. i put the fruit in a bag and added everything but the yeast because of the camden tablet. after 24hrs i stirred it up to make sure the sugars from the fruit had somewhat mixed in with the juice then took a reading and just added sugar in a couple of cups at a time re taking readings til i got to the theatrical alcohol i wanted i believe it was somewhere around 12% then i added the yeast an allowed it to frement for a week stirring it daily. i tested it again before racking it into the secondary fermentation tank. i was kinda following the peach wine recipe that was in the book that came with my kit from midwest supplies. im planing to start another with a darker grape juice as the base and use the remain berries i harvested this spring.