In all likelihood, if you are obese or slowly getting there, you know quite well that losing some weight is not really the hard part: if you were to stop eating for a week, you would likely shed 5-10 pounds or more. But it would be a miserable experience, and one almost guaranteed to be followed by an even faster rebound. So, the real challenge of weight management is coming up with a long-term strategy that does not amount to torture - and does not leave you constantly craving for familiar foods.
For folks who want to focus on the most plausible risks, I suggest stockpiling dry survival rations to last around 2-3 weeks; seven 3,600 kcal packets per person should do the trick. That may sound like a lot, but keep in mind that it may take a while for stores to reopen after an earthquake or a flood - so it's not a bad plan to play it safe. And while eating ration bars for a week sounds bland, you may be in no mood for home cooking when you have to fix a collapsed roof and the utilities are cut off.
If you must take regular medications for a medical condition, you’ll likely want to pack an extra set in your survival kit. You’ll need to discuss the issue with your doctor if you require prescription medications, but don’t forget about over-the-counter medications you may need too. For example, if you often suffer from heartburn, you’ll likely want to add some antacids to your survival kit. Similarly, if you have allergies, you’ll want to pack extra antihistamines, and you may even want to include an EpiPen if an anaphylactic shock is possible.
And, of course, people aren't going to stop wanting to get drunk just because they can't pop over to the corner bodega for a six pack whenever the urge strikes. Portability and long shelf-life make liquor of all types a valuable trade good -- people will kill to get a taste of the delicious bottom-shelf leftovers from your local dive bar when their only other option is the equivalent of prison wine.
Ah, one more thing: for you car kit, I recommend getting some ibuprofen and caffeine pills ($8). Sure, if you are getting sleepy, you should pull over and get some rest - but if you really can't, caffeine can help you stay alert. Note that it's possible to overdose; the symptoms are typically just very unpleasant, but in rare cases, can be life-threatening.
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