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64 packets will last 2 days
on March 13, 2011
The Red Cross and numerous disaster preparedness organizations in California, such as the Office of Emergency Services and Department of Emergency Management, recommend one gallon of water per person per day. Since 64 packets contain just over 2 gallons of water, this case will last you for 2 days, or will last a family of two for one day.
The Red Cross recommends that you have at least 3 days of water on hand. The California Office of Emergency Services and Department of Emergency Management recommend that you have 5 days of water on hand. As we have seen during Katrina and in the Japan earthquake, you may need over 15 days of water on hand.
Therefore, a family of two will need up to fifteen cases, and a family of four will need thirty cases.
Safeway sells a gallon sized jug for less than $1.
Therefore, you may want to buy a few of these packets for carrying around, but buy your main emergency water supply from a less expensive source. Even if the packets last for 5 years, it would be more economical to buy regular bottled water from the store every two years. Then you can spend the savings on survival/emergency preparedness gear that is truly helpful, such as a good go pack (one for home and one for car), sleeping bag, cold and wet weather gear, boots, gloves, eye protection, duct tape, two way communications, etc.
Always remember that your water heater will provide between 20 - 40 gallons of fresh, drinkable water in an emergency. That equates to a 20 - 40 day supply for one person, or a 10 - 20 day supply for two people (again, one gallon per person per day).