Making meals, chicken and spices

Food is a rather basic necessity, and not one Americans are really known for skimping on. One of the cheapest ways is to make it yourself. As such most people ususally calcualte a meal's price by the main ingredients while things like spices and other partial use items tend not to be included.

But having just recently needed to stock a kitchen, I've been experiencing 'start-up costs' buying things that are needed and usually last long term, such as spices, canned products, and cooking oils. Which, while used in relatively small doses over a long term when cooking has me wondering just how much that was compared to a meal's one time ingredients. Reusable ingredients can be calculated as a the price times a fraction of the amount used vs total amount in the package. So pulling a simple example (few ingredients) a chicken and rice dish:
one time: chicken, veggies (swiss chard), rice (we get 10lb bags but it's a main ingredient)
reuse: soy sauce, vinegar, garlic, olive oil.

one time: $6.77
reusable: $1.41

So that was a rather simple meal relying on many common ingredients and few single use ones. I'd expect more complex meals to skew further towards the one time cost, although very simple meals might solely consist of one time costs (I'm thinking something like a loaf of bread here). So I'm now a bit wary about the 'true' cost of making a meal, though that calculation did take a while to come up with. Perhaps just include an overage percentage to cover such expenses might be good enough to provide a quick estimate.