Chocolate Popcorn Fudge

2 cups sugar
2 squares unsweetened chocolate (2 oz)
1/4 cup sweetened condensed milk
3/4 cup water
1 1/2 cups popped corn, chopped
1 tablespoon butter or butter substitute
1 teaspoon vanilla
1/8 teaspoon salt

Melt chocolate in saucepan. Add sugar, milk, water, butter, and salt. Boil to soft ball stage (234 - 238 F). Remove from fire. Add flavoring and popped corn. Cool to room temperature. Stir until creamy. Pour into well-buttered, shallow pan. Cut in squares.