I agree with what Frenchieman and nomerci have said. There are real problems but limited solutions. You can only do your best and be mindful of the avoidable dangers. Organic produce is hard to find, but knowing the basic rules and regulation of production in the countries of origin helps. For example, French apples won't have as many pesticides as American ones, and given the current state of affairs in Yemen, I am guessing the government is not really regulating its apple production at all, so who know what you'll get.

We bake our own bread in a bread machine, using flour from a trusted source, which helps us avoid giving our kids the cheap Chinese grain and various processing agents used in a lot of the store bread here.

Milk is the hardest think to get around.