I have been reading on net that drinking baking soda will help kidneys. wanna know if it really does..! thanks?

Not ideal longterm: It's generally not a good idea to do long term for various reasons. Baking soda has impurities, and though these are for the most part regulated, they would be harmful when consumed regularly. The level of acid imbalance that you would create long-term would create other problems including bone density issue, blood sugar issues and problems with absorption of nutrients.