Explain the housekeeping arrangements. (From Book 3 Chapters 6-10)

Darnay has had to pay dearly for his food while he was in prison, so the household began to live very frugally. Even so, Miss Pross and Jerry Cruncher, who usually went food shopping, had to shop at different stores to keep from raising suspicion or envy of their relative wealth. Before they go shopping, they staunchly pronounce themselves English citizens loyal to the King.