Water Bottles:

save all the plastic soda bottles through out the year. wash and rinse, air dry. when it comes time to fill um up, fill with filtered water from your kitchen sink, place
2 drops of bleach per quart or liter of water.
8 drops per gallon of water.
16 drops per 2 gallons of water.
1/3-teaspoon per 4 gallons of water.
2/3-teaspoon per 8 gallons of water.

[link to www.superprepper.com (secure)]

no need to freak out and run to the store and panic buy water.
besides, the soda bottles are heavy plastic, not like those cheap ass water bottles you buy.