I'd like to talk about water storage today because I think many of us don't think about it at all. I have mentioned previously that you would need a gallon a day per person to be comfortable, but you would only need a quart a day to survive. Very different numbers and two very different ways of looking at your storage amounts.
So lets do some math: Family of four(4), one (1) gallon per person per day, fourteen (14) days minimum for your average emergency and bam you need to store 56 gallons of water, potable water no less. Now, how do you store that much water? A great way is to use food grade barrels available at plenty of on line retailers, just search for Closed Head Polyethyene Drums. A drum like this will store your water for a year before you have to empty and clean it.
When we talk about water most of us just seem to take for granted that clean water is everywhere, but as most disasters show us, clean water can be pretty darn hard to find when you need it most and boiling it will only kill bacteria not remove poisons or heavy metals. So the next thing to address is filtration. Filtration can happen at the lowest level while you are backpacking with a device such as THIS , or you can have an elaborate setup such as THESE. But whatever you choose you have to address the need for more filters, mobility, and the amount of water you want to store, a couple canteens, or 2 weeks worth.
Water is essential to life and in our gloomy future wars will be fought over it. But god always seems to drop some on us every once and awhile, might as well catch some for future use, know what I mean?