Thoroughly cream shortening, sugars and vanilla. Beat in egg, then 1 Tb water. Sift together flour, soda and salt; add to creamed mixture, blending well. Stir in the rolled oats, chocolate chips and walnuts. Drop by rounded teaspoons onto a greased cookie sheet about 2 inches apart. Bake at 375 degrees for 10 to 12 minutes. Cool slightly before removing from pan.