If you are willing to substitute brands, then the number will probably be a lot lower. For instance, Hershey’s brand cocoa used to be inexpensive, but not costs about the same as the most expensive brands at our store. If you switch to the expensive brand (and update the 2020 list), you’ll be looking at 10-20% inflation instead of 50-100%. I’ve noticed this for a lot of products we purchase (some of which simply became unavailable after a few months of price hikes). This mostly means we’re either switching from midrange brands to the most or least expensive, depending on the item.

Of course, this doesn’t actually lower our grocery bill vs. 2020, but we’re also not paying 70% more.