Keep your food plans simple. Basic grains are better than fancy foods of any kind. In addition, basic foods are less tempting to people looking for fancy foods. Keep a supply of lemon juice on hand, to make small amounts of flavored water for yourself and children. Avoid sugar in major amounts.
Sugar has the effect of depressing the white blood cells and thus reduces immune system function.
The amount of sugar in 1 can of pop can suppress white blood cell activity for 24 hours according to studies. You do not need that. Natural does not necessarily mean either safe or good. Arsenic and uranium are both natural as are many harmful plants. If you hope to live off the land, do a lot of research first.