IN A SMALL COMBINE FLOUR, BAKING SODA AND SALT; SET ASIDE. IN A SMALL SAUCEPAN, COMBINE BUTTER, SUGAR AND WATER. BRING JUST TO A BOIL, THEN REMOVE FROM HEAT. ADD 1c CHOCOLATE MORSELS AND VANILLA. STIR UNTIL MORSELS MELT AND MIXTURE IS SMOOTH. TRANSFER TO A LARGE MIXING BOWL. ADD EGGS, 1 AT A TIME BEATING WELL AFTER EACH ADDITION. SLOWLY MIX IN FLOUR MIXTURE. STIR IN REMAINING CHOCOLATE MORSELS. SPREAD IN GREASED 9" SQUARE BAKING PAN BAKE AT 325 DEG F. FOR 30-35 MINUTES. COOL COMPLETELY. CUT INTO 2 1/4" SQUARES. MAKES 16 SERVINGS