"Get some wheat and barley. Also get some beans and lentils. And get some millet and spelt. Put everything in a storage jar. Use it to make some bread for yourself. Eat it during the 390 days you are lying down on your side.
Weigh out eight ounces of food to eat each day. Eat it at your regular mealtimes.
Also measure out two thirds of a quart of water. Drink it at your regular mealtimes.