Which word can best be defined as sparing in food or drink?

The term that best indicates a disposition of being sparing in food or drink is "abstemious." This word originates from the Latin "abstemius," which means "sparing or moderate," particularly in relation to consumption. It describes a quality or lifestyle characterized by restraint, often with reference to diet or drinking habits, indicating a deliberate choice to avoid excess.

In contrast, the other terms present entirely different meanings: "conflagration" refers to a large and destructive fire, "wry" describes a twisted or distorted expression, often conveying irony or dry humor, and "blueprint" denotes a detailed plan, usually used in architectural contexts. Thus, "abstemious" uniquely encapsulates the idea of moderation in food and drink, making it the most suitable choice in this context.