I was at a grocery store yesterday
I got my stuff from a grocery store
I prefer grocery stores to the open market
My favourite is Wal-Mart Stores, Inc., doing business as Walmart, is an American multinational retail corporation that operates a chain of hypermarkets
A grocery store or grocer's shop is a retail shop that primarily sells food. A grocer is a bulk seller of food.
I also shop in a department store is a retail establishment offering a wide range of consumer goods in different product 
That is coolGrocery stores also offer non-perishable foods that are packaged in bottles, boxes, and cans; some also have bakeries, butchers, delis, and fresh produce. Large grocery stores that stock significant amounts of non-food products, such as clothing and household items, are called supermarke
So what items do you buy?
I buy food 
Then you must be operating a .foodbank is a non-profit, charitable organization that distributes food to those who have difficulty purchasing enough food