Rations: Your character needs to pack food and drink when traveling; rations are food that has been packaged for travel. A single ration is enough food to sustain one vigorous adult for a week that is, about 21 meals. Rations for adventurers typically come in two types as follows:
Standard Rations: These rations consist of untreated food chosen and prepared for traveling; they will last up to a week when the characters are traveling outdoors. Carried into a dank, unhealthy dungeon, they spoil overnight.
Iron Rations: These rations are preserved food (beef jerky, hard tack, dried fruits and vegetables, etc.); they are not as tasty as standard rations, but they last for two months (eight weeks) in normal travel and up to a week in bad conditions (such as dungeons).
Elfish Waybread: Famously described to fill a man’s stomach for a day with just one bite. While not quite sustaining, this dry but not-bad-tasting biscuit is very nourishing. Waybread never spoils unless deliberately exposed to the harshest of conditions for a long period of time.