Hopefully, you will be able to bug in for an extended period of time. Having bottled water stored away will help ease the burden when you are getting your footing in tough times. You should have a minimum of two weeks’ worth of bottled water stored away, but as much as a couple of months. Again, if the emergency is short-lived, this will be enough to get you through.
If you are bugging in over the long-term, you will need a water-collection system of some kind. A rain barrel is the simplest option. Be sure to have at least one or two of these on your property and you can capture rainwater. Even if you live in an apartment with a balcony, you can use a rain barrel to collect water. Just don’t catch it as runoff from the roof as most roofing tiles contain chemicals that can contaminate the water.

Modern-day survivalists aren't generally regarded as the most sane people on the planet. A quick look at any one of the disturbingly common and frighteningly thorough shopping lists they post online drives home the fact that anyone who self-identifies as a "prepper" most likely went off the deep end a long time ago. Sure, it's fine to keep a few extra cans of food and cases of water around for an emergency, but if you start adding body armor and butt paste to your stash, you might want to tell George Miller that it's time to see other people.
The player can reach a "proper ending" in Survival mode by defeating the ender dragon, but this does not actually terminate play; it provides a trophy item, a huge amount of experience, and leaves the End dimension open for exploration. There is also an optional boss, the wither, which becomes accessible in the mid- to late game. The player can also take up any purposes of their own design; one common goal is to fulfill all of the predefined achievements (Advancements in Java Edition). Oceans also bring exploration, as they have corals, monuments and adapted creatures like guardians and drowned.
So Michael Mills at the UK's University of Kent decided to correct this gap in our knowledge. Mills went on an American road trip, spending time talking to (and butchering animals with) 39 preppers in 18 different US states. Rather than rampant paranoia, Mills suggests, preppers are motivated by non stop media coverage of natural disasters, as well as a government that encourages them to prepare for the worst.
The 66-year-old tried starting his own spinoff meetup. Ozarks Resilience Group was to be a pragmatic organization that ran drills on real-life scenarios like hiking out of town with a bug-out bag. After six months of nonparticipation, he gave up. Allen estimates there are several hundred “hardcore preppers” in Springfield, but at most, there’s two dozen whom he would trust in an emergency. 
If worse came to worse and I had to leave the house, this would probably be one of the things I would throw in the car just because it filters treated and untreated water, so if I was camping outdoors and unsure of the water, I could easily filter large amounts of water. Of course, some would prefer to use a Lifestraw or Sawyer filter, but they are small devices that are only really suitable for hikers or survivalists who are expecting to travel on foot for long distances.
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Staying at home might not be an option for long, especially in an urban area with lots of mouths to feed and dwindling supplies. A bunker is ideal, and at the very least should be partly belowground, fortified and well-provisioned. Barring that, a cave or a cabin somewhere away from populated areas will do. As a modicum of reduced exposure, a small, foldable tent or plastic tarp might not be a bad investment.

For the Soon to Be Ready for Anything Prepper

The Ultimate List of the 8 Most Important Surviving Skills that will Make the Difference between Life and Death during a Crisis