How do you make 1 gallon of normal saline solution?

To make 1 gallon of normal saline solution (0.9% sodium chloride), dissolve 9 grams of sodium chloride (table salt) in enough distilled water to make a total volume of 1 gallon (approximately 3.785 liters). Start by adding the salt to a smaller volume of water, stirring until completely dissolved, then gradually add more water until you reach the 1-gallon mark. Ensure all equipment is clean to maintain sterility, especially if it's intended for medical use.