Despite the popular image created by the inefficient US for profit healthcare system, doctors are actually fine with providing low cost alternatives, if the medical principles are followed and the end result is the desired effect. It is dumb to send people to buy stuff that is readily and easily achievable at home. Industrially made stuff like distilled water is for clinics and hospitals who don't have time and have to go through hundreds of patients a day. A person who is presumably at home under medical leave has time to boil water and wait for it to cool down. No need to finance the orphan crushing machine.