As many multi-vitamins as you can afford. Plan on 1 per day per person.

This simple stockpile, which you will keep sealed, will allow life when diverse food sources are scarce.

Anything after this basic stockpile is fair game, depending on your opinion, but at least have this.

If there is any money left over after the multi-vitamins, it should be spent on antibiotics.

If you are no limited funds, anything else would be a waste. You want to have basic health and basic drugs to fight simple diseases.