[header] How to support kidney function [title] Hydrate wisely. [step] Because the kidneys help flush out waste products and drugs, some people might think that over hydrating can benefit their kidney function. But there are no studies that support this and instead recommend drinking four to six glasses a day. 
This amount should be sufficient to support your kidneys' function. [substeps] Stick to water, which is the best option to keep you hydrated without added sugar, caffeine, or other substances to your diet.