Hello! So I've been out and picked 1.3kg of elderberries and I have 2kg of plums sliced and deseeded! I want to make a 25L batch with the two fruits I have. I also have red grape juice from asda I have 6 bottles and 2 bottles of blueberry. I was going to boil the fruit in water but I was just stuck on how much to add with the ingredients I have plus a kg or so of sultanas? I was also going to try and add spice in the form of cracked peppercorns and star anise! Thanks in advance!