Freezing berry juice.
After picking and rinsing, I freeze the juice for making jelly> I run the berries twice through the juicer. freeze the juice in jar. When out of jelly I get a box of pectin, go by the instructions and make 4 pint jars of jelly. I make a bunch of jelly, sell them at Art and Craft shows. I had so many berries I had to do something so I sell at shows. Good luck!