What if I told you that there was no reason to go out and buy gallons and gallons of pre-bottled water. There is such a simple and cost effective way of storing water for your family. How many people now days go out and buy soda in the 20 oz bottles? I would be willing to bet there are many many people that do so. Or how about those gallon jugs of apple juice. Instead of buying the 20oz, why not buy the 2ltr bottles a few times. Not only water, but there are so many uses for these bottles, that it is worth hanging on to a few of them.
Water Storage: It is pretty simple when you think about it. Wash the bottles out with hot soapy water, the hotter the water the better so you can rinse all of the sugars and things out of them. I personally put about 2 cups of really hot water in them. Be a bit liberal with the soap and shake the ever lovin crap out of it, trying to fill the bottle with suds. Let the bottles sit until the suds are all back in the bottom of the bottle. Rinse the bottles very very well. Now, depending on if you have city water or well water will determine the shelf life of your water store.
If you will be filling your bottles from a municipal water source you do not have to do anything special to it, just fill and place the cap on tightly.The water has already been treated and therefore will be safe. Store it in a cool dark place such as the back of a closet or in the basement.
If your going to be using well water for your storage. It is best to put 4-5 drops of bleach in the water to sanitize it. As well water has not been treated, and over time things may start to grow in it that you do not want to drink and could become harmful. Again, store it in a dark cool place where it is easily accessible.
Having said all of that, I truly think that there is no reason to buy "commercial" water. You can save lots of money in doing it yourself.
TIP: When it comes to storing your water, I would suggest writing a date on the bottle so you know when you filled it. If you do not use the water within a years time, empty them out and refill to maintain as fresh of water as you can.
You never know when disaster may strike, wouldn't you rather be prepared, than be the poor shlub down the street that looses his or her mind because they didn't prepare?