A gallon of clean water for drinking.  Every gallon gives you drinking water for one more day.
It fills the empty space in the freezer enabling your freezer to run more efficiently
Should there be a power outage the jugs of frozen water will keep the food frozen or cold a little longer.

 
Fill all the empty space in your freezer with water.  Should you need the room, it is easy to throw the water out (or use it to water plants).
 
I think any plastic container will work, although you might test it by placing it in a container the first few uses in case the jug breaks.  I use gallon milk jugs and have never had one break.
 
I think the frozen water should remain as pure as it was when you filled the jug since it is acceptable to freeze food in water.
 

Any water that is being stored for emergency use should already be purfied. You can use the tap water from the home, or a well, ensure that it is properly purified by using the methods stated above in the article.

Thanks,
Tess

I have never used that method of storing water.  Although it may have remnants of bleach leftover, are you willing to bet that the water is 100% safe to drink?   If there are still contaminents in the drinking water, the effects of ingesting unclean drinking water will be a painful price to pay. 

To make sure that water is good for consumption, it is advised to use the standard practices of cleaning and santizing water offered at the CDC.

Thanks for the comment, and I will continue looking around the web about using this type of water storage method.

Thanks,
Tess
Ready Nutrition