Yes you can add and milk packets, breads, cold cricks, juice, fast moving food items. Study what people eat in your area and keep those things. One things is for sure as per your chart that you should never give money or take money. If you take money removing debt will not be easy and if you give money recovery will not be easy. Therefore in your work also keep as much of Cash items as possible. Do not work or keep things that go on credit.
You have a exposure of working in a good position in a bank, therefore I dont need to give you lessons on the importance of building a good public relation with your customers.
Regarding offering milk to Shivling, do this on a Monday.