Space food may be canned or wrapped in aluminium foil. It may be freeze-dried, low moisture, pre-cooked or dehydrated (with its water removed). If food is dehydrated, it cannot be eaten until the astronauts add hot water to it. Ovens are provided to warm foods to the proper temperature. Many drinks are also in a dehydrated form. Some recycled water is produced on the Station, but extra supplies have to be sent up on resupply missions. Drinks range from coffee, tea and orange juice to fruit punches and lemonade.
Getting enough calories, vitamins and minerals is as important for astronauts as it is for people living on Earth. They have to eat at least 2000 calories per day. During the mission, crew members fill out a computer questionnaire to report what foods they have eaten. Experts on the ground give them advice if they need to improve their diet.