Hi reasoning time,
Cooking the water may actually INCREASE chemical concentrations; it will kill all the bacteria so it will stop you from becoming immediately ill, but tap water is already mostly bacteria free due to chlorine, no?
Boiling kills bacteria, but it increases chemicals ever so slightly. This is because when you boil the water, the PURE H20 evaporates as steam (the chemicals don't come with it), so you are left with less water than with you started (slightly), with the same amount of chemicals, so therefore a higher concentration of chemicals. Obviously the amount of water lost through steam, mostly is insignificant, but nevertheless it technically does increase the chemicals slightly.
You might be thinking, if it is pure H20 that evaporates, then can't you drink this? Yes, you can, and the process is called distillation. You can get distillation filters, if you wish
http://www.babycenter.com/0_water-filters-distillation-units_64385.bc
It removes a huge range of harmful compounds, although a carbon filter may still be necessary to remove the chlorine.
Its a shame that the spring is so far away. Depends how dedicated you are to it. If you bought huge amounts of bottles, you cold probably fit 100s of liters in the car at once, which would last you months. And making one trip in the car every few months might be OK. You say 7 hours, well if you set off at dawn you could be back for bed time!
But I appreciate that this might be going a little far for some people!
And if the spring isn't an option for you, and you live in a city so rainwater is unsuitable, then Reverse Osmosis filters are youre best bet, because they remove the fluoride, which almost all filters DO NOT.
Blessings for your interest in livity,
Joe
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