How to Craft Berry Juice with the Juicer
Build the Juicer
Juice is not made at a normal crafting table. You need the Juicer, which is its own item in the mod. Craft the Juicer first, then place it or open it the way the mod's processing recipes require.
Juice Every Color
Each berry color produces a matching juice: Black Berry Juice, Blue Berry Juice, Green Berry Juice, Orange Berry Juice, Purple Berry Juice, and Yellow Berry Juice. There is also Sweet Berry Juice, which uses Sweet Berry as its input rather than one of the six colored bushes. Feed the matching berries into the Juicer to get that color's juice.
Stock Berries First
Juicing consumes berries, so keep a farm running. Harvest your Black Berry Bush, Blue Berry Bush, Green Berry Bush, Orange Berry Bush, Purple Berry Bush, and Yellow Berry Bush, then carry the berries to the Juicer. If you also have Sweet Berry, set those aside for Sweet Berry Juice.
Use the Juice
Juice is a drink item, so it stacks in your inventory and travels well. Make a batch of each color before a trip so you have variety on hand. Because every color has its own juice, you can process a full harvest in one session at the Juicer instead of running back and forth to a crafting table.