When a monster in the Monster Manual doesn't need food, drink, sleep, or air, it's specified by a [X] Nature. For example, a zombie has an Undead Nature:
Undead Nature. A zombie doesn't require air, food, drink, or sleep.
Devils (and many other extraplanar creatures) lack this feature, and therefore do need to eat, drink, breathe, and sleep.
However, in the DMG, the Nine Hells are described as desolate, inhospitable wastelands. What do devils eat? How do they get their food and water?
I'm trying to flesh out Devils for my campaign, and I'd like to see if there was any official material on this topic. While I'm running a 5e game, relevant material from other D&D editions is also acceptable.