Grocery list optimiser to cut cost

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Household used as given: 2 adults and 2 children, vegetarian. No prices were on the list, so every cost difference below is unknown. This is budgeting help, not diet or medical advice.

1. One kirana walk, by group
- Staples: atta 10 kg, rice 5 kg, toor dal 2 kg
- Oil: cooking oil 3 L
- Dairy: milk for that day (1 L), paneer 1 kg
- Packaged: biscuits 8 packs, juice 4 bottles
- Produce: vegetables and fruit for the week (how much was not stated)

Use the quick-delivery app only for a line the kirana does not have that day. Compare the unit price, including any delivery fee shown, before you switch a line to the app. That fee was not supplied.

2. Bulk, weekly, and waste risk
- Bulk, if you have dry storage: atta 10 kg, rice 5 kg, toor dal 2 kg, cooking oil 3 L. These are the shelf-stable lines on your list. I am not saying this quantity is cheaper. Compare the price per kg or per litre.
- Weekly, or more often: vegetables and fruit, already weekly. Milk is 1 L a day, so buy it on the days you will use it, not as a month's stock. Paneer is perishable, so do not treat 1 kg as a bulk dry good.
- More likely to be wasted if bought too far ahead: milk past the day you need it, and paneer if 1 kg is not finished while it is still good. Vegetables and fruit can also spoil; the weekly amount was not given, so that risk is unknown. Biscuits (8 packs) and juice (4 bottles) are a waste risk only if they sit unused. I do not know if the household finishes them.

3. Swaps to compare, not claimed cheaper or nutritionally the same
- Loose atta against the packed atta you buy now. Compare price per kg at the kirana and on the app.
- Loose rice against packed rice, same comparison.
- Loose toor dal against a branded pack, same comparison.
- A larger oil tin against the 3 L you buy in smaller packs, only if that day's price per litre is lower. The difference is unknown until you check.
- Seasonal vegetables in place of the costliest vegetables that week. They are not the same food. Compare price per kg, and keep the household's preference.
- Some of the weekly fruit in place of part of the 4 juice bottles. Not the same product. Compare the bottle price with the fruit price.
- A kirana or store brand of biscuits against the 8 packs you buy now, if people in the house will eat them. Compare the pack price. Do not assume the same recipe.
- Paneer in smaller amounts through the month instead of 1 kg at once, if a kilogram is not finished in time. You might pay more per kg, or you might waste less. Both money figures are unknown until you compare.

4. Track next month
On one note, write the date, the shop or the app, and the amount for every grocery payment. At the end of the month, add those amounts. There is no baseline yet, because no prices were supplied. Do not invent a saving percent. Next month, compare that written total with the following month.

I can draft a 7-day vegetarian meal sketch that uses the atta, rice, toor dal, milk, paneer, oil and the weekly vegetables and fruit, with biscuits and juice left optional, if you want that next.