Start by boiling the water in a small pot. If you are to use distilled water, skip this part.
Put the chopped cabbage into a blender, and pour water into it. The blender should be about three-quarters full.
Blend at low speed for 1-2 minutes.
Blend the mixture at high speed for 10 seconds. You would want to have small pieces of cabbage left in the juice.
Pour the mixture into the 1-liter jar. Seal it tightly.
Let the jar sit at room temperature for 3 full days. This will hasten fermentation of bacteria in the juice, which can support good digestive function.
After three days, open the jar and pour the contents into another jar using a strainer. This should help separate the solid parts from the liquid.
Cap the jar and store the juice in the fridge. This juice is best served when chilled.