You might be able to broadly track the spending if you use a “food/cash” envelope that you refill and write on the outside the refill date and amount. And if you use a credit card, it’s even easier to simply go thru the monthly bill and checkmark the vendor names / dates for the transactions that likely were food; I keep printed receipts to match up against the card statement so something like a Costco run can be split food /non-food.
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