My parents go to Sam's and Walmart once a month grocery shopping. More often than not they will return home with something that wasn't on the list because they didn't know whether we had it or not. My OCD got tired of this, so I organized their cupboards today and made a spreadsheet with things we normally use, with columns for how many we have, what will fit in the space allotted for that item, and a column for how many we need to fill the space. The items on the spreadsheet are also organized by category (Fruit, vegetables, condiments, etc)
I feel very accomplished today!