Cream butter, sugar, and vanilla.
Add water, flour, chopped pecans, and salt. Mix well until dough forms, kneading together by hand if needed at the end.
Roll cookies into teaspoon-size balls and place on ungreased cookie sheets.
Bake at 300 degrees F for about 20-30 minutes, or until cookies are golden brown and firm.
Immediately remove from cookie sheets and roll in sugar if desired. Serve warm or cool.