Emergency ration

Emergency rations, also known as combat rations, or field rations, are pre-packaged food items that are used when normal sources of food are unavailable.

Included with rations were water packs. (: "Olympia Descending")

Starfleet emergency rations were designed to be eatable by most species serving within the fleet. To most Humans they tasted bland and few people enjoyed eating them.

According to Rachel Daley, the Starfleet Marine Corps designed their rations to be more species specific and were better tasting then those available to the fleet.