Like Monkey Uncle, amazed at many of the prices. Inspired, though... so started keeping spreadsheet of my grocery expenses this year. Started out just over $6/day for one person. Now $5.13/day cumulative 2018.
Have built up some reserve of certain items that were on sale, mostly canned fish. Made a few changes in the small amount of meat purchases that I make. Got better at cooking rice, mostly by learning to flavor it better, hence using rice and beans a bit more often. Learned simple version of bean tacos that I like - cheap delicious ecologically sound staple, added to my meal rotation!
Did learn to price some items more accurately (tomatoes, avocados, spice) and as a result am using them more, not less... a health win. Thanks for the inspiration, modest though my steps may be.
PS. The big win is that I have enough food on hand that can be shared, hence I am now sometimes spontaneously treating guests to impromptu meals, or using "meal at my place" as part of a day plan with friends. A wonderful plus, added to the routine even while total cost is going down. :)