Sift together flour, baking soda and salt. Cream butter, sugar and brown sugar. Blend in eggs, water and vanilla; beat well. Add dry ingredients; mix thoroughly. Cover and refrigerate at least 2 hours.
Enclose each chocolate mint wafer in about 1 tablespoon of chilled dough. Place on greased baking sheet about 2 inches apart. Top each with a walnut half. Bake in moderate (375 degree) oven for 10 to 12 minutes. Makes 4 1/2 dozen cookies.
Notes
This recipe originally called for Rockwood Chocolate Mint Wafers, and was wonderful too, with Rockwood rum chocolate wafers ... or Rockwood mild chocolate wafers. Unfortunately, the Rockwood Chocolate Factory is long gone, and nobody makes them anymore. Andes Mints are the best substitution.