You only have to heat the water to a point to break down the protiens for the microbs or their by products, which are protiens. This is 160 to 180 degrees F. You do not have to boil it for 10 minutes but simply bring it to the point where bubbles start to form. And even on the top of Mt Everst this will be about 160 degrees F. If the water is stored and sealed then there should be NO question of the waters quality.
cheers