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Experts worry most about the grid’s nervous system: 2,000 extra-high voltage transformers. They’re 200- and 300-ton behemoths, individually engineered to meet specific power demands, and on average, they’re 40 years old. Notwithstanding the fact that 85 percent of transformers are imported, the U.S. Department of Energy says it takes between 5 and 16 months to replace a single one. According to the U.S. Federal Energy Regulatory Committee, an attack that destroyed nine of the 2,000 transformers would “cause a protracted nationwide blackout.” There’s no national cache of spare transformers. 
You can eat bugs and worms when you are in the woods and in a survival situation.  While this may not sound very appealing, the truth of the matter is that the longer you are waiting for rescue, the greater the likelihood you will run out of food and you will have to suffice with what you can find. Many bugs contain up to 80% protein, so they are a good source of the nutrient. For a list of edible insects that you can eat for survival, see our article on this important topic.
When the average person thinks about doomsday preppers, they probably think of paranoid right-leaning wing nuts clinging to a small arsenal of guns and stockpiling toilet paper from Walmart in case their conspiracy theories come true. It's a fair assumption — many television depictions reflect that mind-set, though the fears vary from group to group. Some are afraid of government collapse, others fear a solar flare, still others are preparing for a race war they think is inevitable. When those are the dominant examples, it's easy to dismiss the practice as absurd and hysterical.
Different locations present different climactic challenges, which you’ll want to factor into your survival-kit-making decisions. Trips through the northern reaches of the globe, for example, will force you to confront very cold temperatures. This may make things like emergency hand warmers and hot chocolate important in your survival kit. By contrast, you’ll want to prepare for heat stroke, snake bite, and torrential rain if you are hiking or camping in the tropics.
First, you’ll probably want to experiment with more than one variable withdrawal rate tool. I like the web calculator best. But other calculators exist too, including a simpler variable withdrawal option at and Bob Herlien’s variable withdrawal rate spreadsheet (available here). And we probably all get better insights into the flexibility we need to show if we run lots of simulations using different approaches.

One of the best wilderness survival tactics you will ever implement is to think ahead and prepare yourself for the likelihood of being in a survival situation. Whether you raft on the Yukon River’s rough waters or head for Alaska where for an unforgettable backpacking trip through the Alaskan wilderness, preparing for the “just in case” situations is necessary.

If you are trekking through the Yukon or trying to cross the Darien gap, you may find it necessary to wait weeks for help to reach you in a survival situation; but if you are just heading off to your local state park, emergency rescuers could probably reach you in a matter of hours. You’ll want to factor this consideration into your kit-building decisions. If you can expect to wait long periods before help will arrive, you’ll need more supplies than if you are heading out to an easily accessed area. Nevertheless, it is always wise to have the supplies to last longer than you think you’ll need them.
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