In a large mixing bowl beat the butter with an electric mixer on medium to high speed for 30 seconds. Add brown sugar and molasses and beat until smooth. Beat in water until combined. In a medium bowl stir together the flour, baking soda, salt, ginger, and cinnamon. Add flour mixture to beaten mixture; beat on low speed until combined. Divide dough in half. Wrap and chill for 2 to 3 hours or until easy to handle.