Enh, no clue where my camera is.
I think our fridge has the largest combination of things from different supermarkets.
In our fridge is something from almost every supermarket in the northeast.
Hannaford, Price Chopper, Stop & Shop, Shaws, Wegmans, Market Basket, Schnucks, and Target.
Add in our whole kitchen and you can add Aldi, Walmart

, Safeway, Shoprite. Also a supermarket north of Syracuse. A&P maybe? and a couple of supermarkets in southern California.
I end up travelling all over for work and will usually get at least snacks and water from an areas local supermarket which inevitably something of it finds it way home.