Any food that is edible and nutritious. Therefore water is considered food. Allah Almighty says:
(When Saul marched forth with his army, he cautioned: “Allah will test you with a river. So whoever drinks ˹his fill˺ from it is not with me, and whoever does not taste it—except a sip from the hollow of his hands—is definitely with me.” ) Al-Baqara 2: 249
كل ما يؤكل وينتفع به ، فالماء طعام لقول الله تعالى: ( فلما فصل طالوت بالجنود قال إن الله مبتليكم بنهر فمن شرب منه فليس مني ومن لم يطعمه فإنه مني الا من اغترف غرفة بيده ) البقرة 2: 249