alt Hacker News> And most of these supplies and prep are going to last what, ~4 days before they spoil?
Rice lasts a very long time. Tortillas last a long time in the fridge (you can probably freeze them?). Freeze the meat. Beans last forever. Sour cream and cheese last a long time in the fridge and you'll certainly use them for other things.
Guacamole/avocados/other veggies are potentially harder to deal with for long term storage, but that depends and it looks like there are some options. Salsa also keeps for many, many months.
As far as time goes, if you're single, many of the ingredients could be cooked in a batch and then frozen, even as whole burritos.
You're expanding the scope to a much larger process and pattern of behavior that has to be undertaken and managed. Sure it's doable, and you can save a bunch of money that way. But as a one line throwaway comment it's still nonsense.
Also freezing things or letting them sit in the fridge for weeks tends to change the texture. A main point of a burrito shop is the fresh ingredients.