Preheat oven to 350°. In a small heavy saucepan, combine the caramels, water and butter. Cook and stir over low heat until caramels are melted. Remove from the heat and set aside. , In a small bowl, beat the eggs, sugar, vanilla and salt until smooth. Gradually add caramel mixture. Stir in chopped pecans. Pour into crust. If desired, arrange pecan halves over filling. , Bake until set, 35-40 minutes. Cool on a wire rack. Refrigerate leftovers.