Re: "You can get 2,000 calories for a couple bucks." Extraordinary claims require extraordinary evidence. Can you please let us know how can you get 2,000 calories for $2?
Rice bought in bulk can certainly be had for that price per calorie with some left over for a little protein. I don't recommend anyone follow such a diet though.
I'm a little surprised you didn't get scurvy, or have bone health issues (because of a lack of calcium or vitamin K2), have electrolyte imbalances, or have imbalances in fiber and essential fatty acids. But good for you. Thank goodness we don't base nutritional advice on anecdotal evidence.
Rice is $20/25 lbs, and 1600 calories/lb for 2000 calories/$
They are 6.5lbs after deboning. Cooked chicken skin on is 950 calories per pound. That is 620 calories/$.
Tortillas themselves are 110 cal, and 4.99 for 100ct, or 2200 cal/$