This is what you said: "Make your burrito or bowl at home, and it'll cost $4 or less"
That statement implies you can straightforwardly save by substituting that one meal with a made at home meal. The reality is much more complicated, as shown by your backpedaling to making several burritos and other meals.
I could just as easily lob that economic literacy jab right back at you. For example, perhaps OP has a burrito once a week, to break up the monotony of eating a home made sandwich every other day. That would be savvy, right?
I mean, I figured the concept of buying ingredients to make a single meal for one person and then just throwing whatever's left away is so ridiculous on the face of it that I wouldn't need to qualify it, but apparently I was wrong.
I currently live by myself and I bought a pork loin to barbecue for Independence Day as a treat. I bought one of the smallest ones I could find, then ate about a third of it that night. Then I put the rest in the fridge and ate it over subsequent days - one night I had it on its own with some veggies on the side, and another I sliced it up thin and topped some ramen with it. The loin cost me about $5, but to say that the meat for that one meal on Independence Day cost me $5 is baffling logic.
Maybe we can simplify this. Do you eat breakfast cereal? If you buy a box of breakfast cereal for $4 and a gallon of milk for $4, then have a bowl of cereal with milk the next day, do you think that means that one bowl of cereal cost you $8?