How can belief be strengthened when drinking Zamzam water?

The strongest way to correct the belief regarding the benefit of Zamzam water is to review the texts that mention its virtues and the experiences of those who have drunk from it. Among these texts are: "Zamzam water is for what it is drunk for," and "The best water on the face of the earth is Zamzam water; in it is food for the hungry and a healing from illness." Many have indeed benefited from Zamzam water in treating illnesses, such as infertility and cancer.