You searched for: “xerophagia
1. The eating of dry foodstuffs; subsisting on a dry diet.
2. A diet of bread and water.

Actually, xerophagy refers to a type of religious fast in which the jejunator [the person who fasts] consumes only bread, salt, unseasoned vegetables, and water. It’s strange that a word element [xero] which means “dry”, includes water.