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In Time of Emergency - A Citizen's Handbook on Nuclear Attack, Natural Disasters (1968) by United States. Office of Civil Defense
page 56 of 103 (54%)
used after it has been purified. This is how to purify it:

1. Strain the water through a paper towel or several thicknesses of
clean cloth, to remove dirt and fallout particles, if any. Or else let
the water "settle" in a container for 24 hours, by which time any solid
particles would have sunk to the bottom. A handful of clay soil in each
gallon of water would help this settling process.

2. After the solid particles have been removed, boil the water if
possible for 3 to 5 minutes, or add a water-purifying agent to it. This
could be either: (_a_) water-purifying tablets, available at drug
stores, or (_b_) two percent tincture of iodine, or (_c_) liquid
chlorine household bleach, provided the label says that it contains
hypochlorite as its _only_ active ingredient. For each gallon of water,
use 4 water-purifying tablets, or 12 drops of tincture of iodine, or 8
drops of liquid chlorine bleach. If the water is cloudy, these amounts
should be doubled.

There would not be much danger of drinking radioactive particles in
water, as they would sink quickly to the bottom of the container or
stream. Very few would dissolve in the water. Although open reservoirs
might contain some radioactive iodine in the first few days after an
attack, this danger is considered minor except to very young children.


CARE AND USE OF FOOD SUPPLIES

Food also should be rationed carefully in a home shelter, to make it
last for at least a 2-week period of shelter occupancy. Usually, half
the normal intake would be adequate, except for growing children or
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