Add water, cucumber, apple slices, mint, and greens and sweetener of choice into blender, and blend on high until completely smooth. Strain through fine mesh strainer, nut milk bag, or no strainer at all (if you don’t mind a heft of pulp), and drink immediately, or chill in refrigerator for up to 24 hours. You can play with this blend and up the mint, citrus, or greens as you like!