I assume you mean away as in not coming home that day? Even so makes no difference, i cannot see why there is an entitlement, my place of work is my home, if i go to the office i pay for my own lunch, as does everybody else who goes to the office from their home, even though their main place of work is the office.
If you don't want to have to buy lunch then take a packed lunch, that's what i did for years. And before anybody says it, if it's hot get a cool bag, if it's cold take a flask with hot soup.