I am going to be homeless soon and every penny is going to count (literally). So I want to be able to get the most out of my money and eat food that is going to give me the best possible coverage of my nutritional needs. My budget is probably going to be less than $15/day – practically nothing – what kind of food should one spend their money on in such circumstances? Canned stuff? Fruit? Bread?
closed as off topic by VPeric, J. Winchester, michael, Dave Liepmann, Matt Chan♦ Aug 29 '12 at 11:05
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Whole milk, bread, canned veggies, and peanut butter are all fairly cheap for their calorie content. If you are able to cook you'll be able to save a substantial amount.
Bananas were always my go-to food when I was starving and didn't have much money, their regular price is always quite cheap, and they're quite beneficial (unless you have a sensitivity to histamines), especially if ripe. You don't get much of an advantage from organic bananas either, the cheap regular ones are hardly any worse.
Shopping while hungry is always a bad idea, so bananas also help for that. Go straight to them, buy 1-2, eat them, then shop for the rest of your food. You'll be able to make smarter decisions if you're at least moderately satiated.
I would also pick wild berries, although this is clearly not the season for that.