Ecommerce is the best platform in india, amazon and walmart is good but according to my opinion reliance mart is good there are different type of material of food related are available.
Walmart in India? Are you sure! 
Recently Walmart bought flipkart platform for a premium price tag! But the name is still Flipkart.
Reliance mart/ market is offline whole sale store...
Walmart has already stores in India but not everywhere. They operate in selected location currently. Its going to be a big challenge for these stores because reliance has a mart, V Mart exists, DMART and Walmart, Big Bazaar with so many large scale business existing the competition is already very tough between them.
http://www.wal-martindia.in/our-locations