Here is a comprehensive view on the Indian consumers’ behavior and brand preferences when it comes to online grocery buying.

"When e-commerce entered retail life in the mid-1990s, it was understandably regarded as just another channel of distribution – indeed, as just one more store. With this perspective, the key performance metric was (and generally remains to this day) site revenue. Conversion, another key metric, was defined as site transactions as a percent of site visits.
This still makes sense – but at a narrow, misleading level, because e-commerce no longer defines the connected world for retail.
In this age of Google and Facebook, the primary value today of the Internet to the shopper – and to your brand – is less about transactions, and more about search. On the PC, on the tablet, on the mobile devices, amidst the aisles.
The Internet – and the search function of the ever-mobile Internet – is now the front door of the entire brand."
Online retailing of Fast Moving Consumer Goods (FMCG) / Consumer Packaged Goods (CPG) has not been caught up so far, not just in India, but also across the world. It is probably the last big segment / sector that is still largely out of the online commerce ambit and represents the next big challenge.
FMCG’s (grocery / household essentials) share of wallet is not only very high, but it is also very consistent and is rapidly growing over time, and therefore there is a lot of interest in wanting to address this market.