Coolant change

Today I went to the Suzuki servicing at YC Enterprise. Its time to drain all the brownish toxicated coolant fluids from the car and replace it with Denso long life coolant. The service workers told me to buy 4 bottles of 1500ml of sehat water at the YC enterprise and it cost 6 dollars. The coolant cost only 25 and labor charge also cost 25 dollars.