Well now there is an answer to these problems. Somerset Local Food Direct lets you shop online for the best of local produce, much of it organic, and have it delivered and stocked in the cottage before you arrive. Sadly this only currently works for Friday arrivals, just order by the 9am on the Tuesday and it all just happens. Magic. They have a very extensive range of food, and its a friendly and thoughtful service.
Click the link, choose Gorge View Cottage and order away.
Of course you might also be tempted to take a bit of Somerset back with you: have a delivery just before you go home to save on that tedious moment when you walk in to a kitchen with a half-empty fridge or larder.