In small bowl stir together flour, sugar, baking soda, and salt. In large bowl with mixer at low speed beat together margarine, peanut butter, eggs, water, and vanilla just until blended.
Add flour mixture, beat until blended. Increase speed to medium; beat 2 minutes. Optional: stir chocolate pieces into batter.
Drop by rounded tablespoonfuls 3 inches apart onto ungreased cookie sheets. Flatten slightly with floured bottom of glass.
Bake in 375 F oven 10 to 12 minutes or until lightly browned. Cool on wire rack. Store in tightly covered container. Makes about 2-3 dozen.
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