The Zamzam Water from Makkah.
 
The Prophet Muhammad (SAW) said the best water on the surface of the earth is that Zamzam. In it, there is food for hungry and a cure for the ill.
 
The Prophet Muhammad (SAW) said before you drink Zamzam water, Do Dua to Allah because at that moment before drinking Zamzam Water. Your Dua gets accepted. Ameen.