In a small bowl, combine coffee and water; set aside. In a large bowl, cream butter and sugars until light and fluffy. Beat in the egg and vanilla.
Combine the flour, baking soda and salt; add to creamed mixture alternately with reserved coffee mixture, beating well after each addition. Stir in chocolate chunks and nuts if desired. Cover and refrigerate for 30 minutes.
Shape tablespoonfuls of dough into balls. Place 2 in. apart on greased baking sheets. Bake at 350° for 10-12 minutes or until golden brown. Remove to wire racks to cool.
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