According to Genesis, food was placed in Noah’s Ark to provide nourishment for Noah, his family, and the animals. Genesis 6:21 tells Noah to take every kind of food that is eaten and store it for use.
This instruction appears after the Ark’s dimensions, construction materials, compartments, and animal-preservation command. It shows that the narrative treats survival as requiring both shelter and supplies. The verse does not provide a menu, quantity, storage method, or detailed ration plan.
The answer is therefore the general category “food,” rather than grain, hay, fruit, or another specific item. Those foods might be imagined in reconstructions, but Genesis does not specify which individual foods were stored.
The passage also helps distinguish the Ark story from later retellings that focus only on bringing animals aboard. In Genesis, Noah is explicitly told to prepare provisions for the entire community of humans and animals during the long period aboard the vessel.