In a high-powered blender, working in two or three batches, blend the kale and collard greens with 2 cups water until the mixture is uniform and smooth, 30 to 45 seconds. If you have a tamper on your blender, using it will help break down the greens. Turn off the blender, add the celery and parsley, and blend until smooth, 30 to 45 seconds. Add the pineapple, banana, apple (if using), lime and lemon juices, and salt (if using) and blend until smooth. Top off the mixture with enough water to make 64 oz. total. Blend for another few seconds to fully incorporate.
Divide the smoothie among four 16-oz. mason jars, seal tightly, and store in the fridge for up to 3 days, or enjoy immediately. The smoothie may separate a bit if stored in the fridge; just shake the jar before enjoying it.