Blend the first four ingredients in a food processor or blender. I chose to push through a sieve over a non-metal bowl* to remove large pieces of spinach. Then, using a non-metal* spoon, stir in the bentonite clay, as much as needed to reach your desired thickness. Really work it in with the back of the spoon against the sides of the bowl to break down any lumps and reach a smooth consistency. *It's important that all the tools you use that will touch the clay are non-metal, because the clay will react with metal.