Many years ago, a church friend and her husband relocated to China, so insisted that the company move their food storage with them. I'm sure this was a huge expense for the company, but they did it anyway. After a few years in China, they were relocated to another country, but realized how impractical it was for them to move all of that food a second time. So this friend decided to give away her food storage before leaving China. She spoke with a Chinese liason and asked him if she could give the food to some of the men who were doing repairs in her apartment. She wondered what kinds of food would be best to offer them. She had a lot of dried beans and wondered if they would like them. The liason answered and told her that the best food to give them would be her stored rice. He explained that beans take a lot of energy to cook. Men such as these could not afford the gas to cook the beans. Rice takes much less energy to cook.
I've thought of this experience many times over the years and have decided that the Chinese really are the masters of living with very little. Most Chinese stir fry vegetables over a very high heat. This causes the vegetables to cook very quickly, using less energy. If you find yourself in a true survival situation, unless you have unlimited energy source, consider cooking foods that use less energy. Stick with foods like potatoes, rice, and fresh vegetables.
Put one part white rice, and two parts water in a pan.
Bring to a boil.
Reduce heat and cover.
Simmer for 15 minutes (don't take off the lid during cooking time.)