Place all ingredients in a high powered blender such as a Ninja or Vitamix.
Blend until the liquid is green and there are no particles of spinach left visible.
Child in the fridge, stirring occasionally to reduce the foam.
Serve over ice.
Notes
Please note that the nutrition data given here is a ballpark figure. Exact data is not possible. Sweetener is not included in this data and will depend on the type you use.