Press the pie crust into a pan, and preheat the oven to 350F. In a blender, combine the water and walnuts and puree until smooth. Add the remaining ingredients, and continue blending until all are evenly incorporated; batter should be uniform and smooth, so scrape down the blender sides if necessary. Pour batter into the pie shell, and bake for 40 minutes, or until set (no wiggling when gently shaken). Remove and cool before slicing.