Depends where you live, the time of year, etc. Dandelions for the flower/tea, dandelions for a salad, and dandelions for the root/coffee can get you a few meals, but you need to find somewhere to harvest them that doesn't get any weed killer, which is likely at home, but is that enough to eat? You also need to let them grow and put out seeds to not kill them. After that you have raspberries, but it's a gamble on whether the birds and bugs will get to them first or not, and you need protection from ticks and hours to harvest them. You can also get mulberries, but many of mine that are local require stepstools, ladders, or climbing the tree. You're not going to get everything you need out of them, but you could get decent amounts of food as long as you don't mind dying in the heat and humidity, ticks, and insects.