This is a great place to look for starters, to address any specific needs your family might have: Mother Nature. The author, Dr. James Duke, has worked all over the world as a botanist, studying plants as medicine in different cultures. He has several books, such as this one available on Amazon.com;
Green Pharmacy Handbook. That's green as in plant, not "green living", for those FReepers who might have a coronary over the title!
If you do buy vitamins, make sure they are made from food grade materials, not vitamins such as Centrum or One a Day.
what do I need to know about Mg fire starters?
Again, from Amazon, "By scraping the "shaving edges" with the blade, you will accumulate a pile of magnesium shavings. Then simply scrape the "sparking insert" to ignite the shavings." mg fire starter
And ALWAYS have honey on hand. It never goes bad, is a great food source, and can be used medicinally inside and out. You can even wash your face and hair with it.