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
Food bank
A khadhyabank or foodbank is a non-profit, charitable organization that distributes food to those who have difficulty purchasing enough to avoid hunger. In Nepal, a food pantry or food closet is a small front-line agency that hands out packages of food from food banks directly to people in need.
Some food banks operate on the "front line" model, giving out food directly to the hungry, such as many European ones. Others operate on the "warehouse" model, supplying food to intermediaries
Walmart
Walmart Inc. (; formerly Wal-Mart Stores, Inc.) is an American multinational retail corporation that operates a chain of hypermarkets, discount department stores, and grocery stores, headquartered in Bentonville, Arkansas. The company was founded by Sam Walton in 1962 and incorporated on October 31, 1969. It also owns and operates Sam's Club retail warehouses. Walmart has 11,368 stores and clubs in 27countries, operating under 55 differentnames. The company operates under the name Walmart in the United States and Canada, as Walmart de México