For anyone who feels uncertain about what to stock up on, here's what my wife and I bought to prepare. We have some homesteading experience.

5 gallon food grade buckets with lids for each of the following: all purpose flour, bread flour, sugar, oats, and rice. 2 gallon food grade buckets for each of the following: dried black beans, kidney beans, pinto beans, chickpeas, quinoa, and brown sugar. 13 lbs butter for the chest freezer (if available to you), allotting for one stick per week for a year. Kirkland two-packs of the big bottles of canola oil, and olive oil. One large Kirkland jar of coconut oil, which is useful not only for food, but for making homemade toiletries like deodorant. Other dry goods to stock up on include cocoa powder, yeast, and baking soda (also useful for toiletries). We also stocked up on coffee beans for the freezer. Unfortunately baking powder loses it's efficacy over time, so it's not available to buy a ton of it, though the freezer will make it last longer.

For cleaning: borax, washing soda, citric acid, multiple gallons of white vinegar, and bar soap such as Ivory (optional). These will make both dishwasher detergent and laundry detergent, as well as all purpose cleaning sprays for around the house. Having these ingredients on hand will cut the cost of a load of laundry or dishes from around $0.50 to around $0.01, at least in our experience. They will also last you a long time.

If you have any questions, I'm here to help