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When you ask most people how to catch rainwater, they think it is as simple as having a slanted surface that drains into a gutter and then into some kind of holding tank. While this may be true in its most basic sense, there is much more that goes into catching and filtering rainwater so it will be safe to use (potable) and store for a long period of time.
An important thing to consider is whether catching rainwater is legal in your area. There are numerous counties, local municipalities, and even states that have anti-water catchment laws. Other red-tape may include HOA rules prohibiting the set up of a water catch system.
There are 4 basic steps to the whole process: catching, holding, filtering, and storing it. Don’t forget the means to pump it or access it so you can at least get buckets. Of course, you want to make your system as convenient as possible, not to mention as large as possible. Water is life and if done wrong, can kill with pathogens and bacteria that can make you sick. Even though the water is usually pure and safe when it falls from the sky (barring polluted areas, of course), the surface it lands on may have bird droppings, rotting vegetation such as leaves and other debris. Filtering is very important!
Bonus: How to Make Pemmican, the Original Survival Food
Invented by the natives of North America pemmican was used by Indian scouts as well as early western explorers.
Native Americans spent a great deal of time on the go and depended on having portable, high-energy, highly nutritious, and filling foods that would last for long periods of time without refrigeration.
Pemmican is a portable, long-lasting, high-energy food. It's made of lean, dried meat that's crushed into powder and mixed with hot, rendered fat. This makes it one of the ultimate foods to have stockpiled for when SHTF or disaster strikes.
People really should avert their gaze from the modern survival thinking for just a bit and also look at how folks 150 years ago did it.
These guys were the last generation to practice basic things, for a living, that we call "survival skills" now.