Creator: TheProTalks
2325 Points
Joined January 2016
Sorry to say but I differ with your interpretation.
To substantiate my answer let me post you an article from "The Quint" where they have categorised essentials and other products as per the GST Rate applicable to them.
Here's the link https://www.thequint.com/business/2017/05/19/goods-and-services-tax-rates-and-products
Just head over to the 18% rate section where you will find "Mineral/aerated water (without sugar)".