1. Juicing is related to tools. If a tool is used for extrusion, it is generally not necessary to add water, and it can be extruded directly. If juice is squeezed with a blender, water is usually needed. If you juice directly, it may affect the life of the juicer and damage the machine.
2. Squeezing juice is related to personal taste. People who like to drink strong juice don't need to add water. If they like light juice, they can add water according to their personal taste.
3. Squeezing juice is related to the fruit itself. Generally, you don't need to add water to juice all the fruits with water like watermelon, but you can add some water to apples and carrots.