In the biblical Noah’s Ark story, Noah preserved food inside the Ark for himself, his family, and the animals.
Genesis instructs Noah to take and store every kind of edible food before entering the vessel. The food provision is essential because the occupants remain inside while the flood covers the land. The text does not give a complete menu, a total quantity, or a detailed system for distributing meals.
This instruction is sometimes overlooked in illustrations that focus only on the animals. The Ark narrative presents survival as requiring more than shelter: Noah must bring people, animals, and supplies together. The food command also helps explain why the vessel is described as having interior rooms or compartments.
Genesis does not identify the Ark’s exact storage technology, preservation methods, or daily ration schedule. Those practical details have been supplied by later reconstructions and fictional stories. The canonical answer is simply that Noah was told to store food.