Thomas spoke about these in his article on purifying contaminated water. Basically, the reverse osmosis water purification systems, like the one featured as #5, will take care of larger contaminents. Couple that with ultraviolet disinfection and the rest of water purification is pretty well taken care of without requiring anything too expensive. Remember that this system requires electrical power, so you’re going to need to take that into consideration. But with a solar panel generator, it’ll do the trick perfectly.

It’s impossible to carry all the food you will need for a week unless you’re eating very high density proteins like nuts.  Nuts and dried meat are two of the easiest off-the-cuff meals.  Canned food has a lot of water that is wasted during the cooking process.  Stay away from heavily flavored or salted nuts.  The amount of salt present in the unsalted nut mixes is still sufficient enough to replace electrolytes.
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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