There are a couple of options here. First, I will go with what I use. I recently moved from using a 100w Paxcess battery to use a much bigger Goal Zero Yeti 1200w system which is more capable of powering most household items. While I found the Paxcess really good to use as a backup power source for camping, or for working outdoors, I found that it only powered a few items. The Goal Zero system is much more efficient at powering most of our home needs and is an effective competitor against fuel systems but is much more efficient as it can receive a quick charge from solar panels, and makes next to no sound, unlike fuel-based generators.
Water should be able to be stored indefinitely provided it is not contaminated in any way. The problem with storing water in a car is the heat or cold. In the summer time, your water could bake. In really hot environments, if your water is stored in plastic, chemicals in the plastic can leech into your water. There could be some debate about what is the greater harm, chemicals or death by dehydration, but it is something to consider. In the same way, water in the winter can freeze, but as long as it isn’t getting contaminated from any other… Read more »
One newsletter deemed by some to be one of the most important on survivalism and survivalist retreats in the 1970s was the Personal Survival ("P.S.") Letter (circa 1977–1982). Published by Mel Tappan, who also authored the books Survival Guns and Tappan on Survival. The newsletter included columns from Tappan himself as well as notable survivalists such as Jeff Cooper, Al J Venter, Bruce D. Clayton, Nancy Mack Tappan, J.B. Wood (author of several gunsmithing books), Karl Hess, Janet Groene (travel author), Dean Ing, Reginald Bretnor, and C.G. Cobb (author of Bad Times Primer). The majority of the newsletter revolved around selecting, constructing, and logistically equipping survival retreats. Following Tappan's death in 1980, Karl Hess took over publishing the newsletter, eventually renaming it Survival Tomorrow.
Since people began building fallout shelters during the Cold War, canned nonperishable food has been recognized as great to have around when the going gets tough. Freeze-dried food and MRE (Meal, Ready-to-Eat) military rations with years of shelf life are also good options that take up less space per available calorie. [Doomsday Facts (and Fictions)]