1. Build a stockpile of food
Having a stockpile of food is a great first step to take to protect your food security (in addition to planting a garden, learning to hunt and building a greenhouse). Stocking up on your favorites also means you'll be eating Klondike bars and Skittles years after the factories shut down for sheer lack of ingredients and energy. You should have enough food on hand to feed you and your family for at least three months. It wouldn't be a bad idea to have more, too, since food will be a great asset in bartering.