"The Homeostat," Doctor Sparke explained, "is about the size of a thin pound box of candy, is enclosed in a titanium case, and is powered by a well-shielded store of nuclear material. Built chest-high into the oceanaut's suit, it is crammed with hundreds of miniature parts much too complicated for me to describe. The Homeostat becomes the vital 'organs' of the oceanaut by means of a plastic tube that extends from the top and is inserted into and coupled to an opening made in the throat just below the Adam's apple. An open system through which water constantly flows, the Homeostat provides the oceanaut with food manufactured from plankton, and oxygen and fresh water derived from the sea. At the same time it eliminates CO2 and other wastes as it maintains a steady flow of vitamins, of coco de mono, a South American drug which checks the growth of hair, and also a psychic energizer that enables the oceanaut to function eighteen hours without tiring."
Louis Wolfe, Journey of the Oceanauts (1968)
When planning long travels far from shops, there is a selection of basic foods which can be taken along, all long-keeping and light in weight. They should be packed individually in brown paper bags, not in plastic, and then finally in a waterproof rucksack.
All of the flaked cereals, oats, barley, corn, etc.; toasted wheat flour (ready to eat, merely to be mixed with milk or water; grated raw carrot, sterilized by roasting, and packed into jars; dried fruits, especially raisins, dates, apricots, and prunes; (also the dried dom fruits, from the dom tree or Christ-thorn, a small berry-fruit which is almost always on the dom trees, and which keep indefinitely after easy drying. It is carried by the Bedouins on their travels, and was used as a travel food by Christ. A shrub-tree, it is abundant in Galilee.); shelled nuts and pine kernels; sunflower kernels; black olives (dried); a jar of honey; wholewheat biscuits, or sundried or fire-rusked slices of wholewheat bread; dried powdered spices as flavor and tonic for use with the cereals, etc., such as marjoram, thyme, sage, rosemary; raw groundnuts (peanuts) and also raw peanuts ground into flour; carob pods; and of the dairy products, dried milk -- dried milk in cones (sold in Arab shops for travelers) keeps indefinitely, and when crushed into water makes a good milk mixture for eating with the flaked or powdered cereals; also hard cheese and Balearic type cheese . . . salt and cayenne pepper and the common peppers.
--Juliette de Bairacli Levy, Traveler's Joy: A Personal Guide to the Wonders and Pleasures of Gypsy and Nomad Living (New Canaan, CT: Keats Publishing, Inc., 1979), 158-59.