[PowderMonkey]

"I already had hygiene pretty well covered but he made it very plain that lack of it costs more lives than anything else."

Yup. Most folks don't realize that in a SHTF scenario it won't be the zombies, gunfire, or starvation that get you. Infection will be your number one threat. When ensuring adequate hygiene, Step One is a water purification system. All the meds in the world wont save you if you don't have potable water for cleansing wounds, cooking, and drinking. Absent that, septicemia, strep and cholera will overwhelm all preps.

[Kartographer]

From Wikipedia:

Diarrhea (from the Greek διάρροια meaning "flowing through"[2]), also spelled diarrhoea, is the condition of having three or more loose or liquid bowel movements per day.[3] It is a common cause of death in developing countries and the second most common cause of infant deaths worldwide. The loss of fluids through diarrhea can cause dehydration and electrolyte imbalances. In 2009 diarrhea was estimated to have caused 1.1 million deaths in people aged 5 and over[4] and 1.5 million deaths in children under the age of 5.[1] Oral rehydration salts and zinc tablets are the treatment of choice and have been estimated to have saved 50 million children in the past 25 years.[1]

Anti-Diarrhea tablets!