Using a mixer, cream margarine and sugar. Add water and vanilla, mix again. Add flour and salt, then mix. Stir in nuts by hand. Store in a tightly covered container in refrigerator for several hours. Roll into finger shapes. Preheat oven to 325°. Bake approximately 30 minutes. Let cookies cool and pour confectioners sugar over. Gently shake, so cookies are coated with sugar.
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