Please share about the format of retail businesses you know are working during the quarantine. And including the ones who have adapted to it by making changes. And those who are preparing to adopt and re-open soon. 
As far as I know, and research - that convenience stores (such as mini-markets) are allowed to work in most countries. Those who are selling food, vegetables, and necessary products. Also, some cafes and restaurants are allowed to work through deliveries. Some cafes and restaurants have started their business model into hybrid format: starting selling fruits, vegetables, fresh meat and fish, and sets for salads, etc. to help people cook at home fast.

In India rules are different in every place each state and zones are classified as Containment, Cluster, RED, Orange, Green where the color represents the intensity. Every zone has its own governing rules but few things which are common are the essential commodity stores(Retail), Vegetable markets can be opened for a period of 3 hours. Medical and drug stores, Hospitals can open daily for full time, and alcohol selling stores are now permitted.

In containment and clusters none of the stores or service providers are allowed to open only government executives can reach out to houses and gather the required to the people.

One new development in every store is that they have adopted to online presence and started delivering goods and services to door step.