John Lightfoot on John 21:5

[Children.] By what word soever Christ expressed this children to them, it seems to be a very familiar and gentle compellation, that his disciples, from that very salutation of his, might discern him. They did not know him by sight, as appears, verse 4: he would have them know him, therefore, by the title he gave them.

[Any meat.] Very usual amongst the Rabbins may not unfitly be rendered meat for one single repast: as if Christ should have said, "Children, have ye any meat with you sufficient for a breakfast or a dinner?" But if any meat should signify any sort of meat that must be eaten with bread, as Camerarius thinks, then Christ's words seem to have this meaning: "Here, I have bread with me: have you taken any thing, that we may eat this bread?" and so meat may be distinguished from bread.