Carefully sealed tuna fish.
The item id for Canned Tuna in unturned is 79. You can use this ID with the commands below to spawn the item, give it to a player or buy it on a modded economy server.
Useable: Consumeable
Size_X: 1
Size_Y: 1
Size_Z: 0.3
Food: 40
Water: 10
ConsumeAudioClip: Sounds/EatCrunchy.mp3