2 tablespoons of salted butter contains approximately 22.8 g of fat, 4.4 g of water, and 400-450 mg of salt. 2 tablespoons of unsalted butter contains approximately 22.8 g of fat and 5 g of water. You would need about 2.36 tablespoons, or 2 T and 1 t, of butter for a more accurate fat substitution.