I don't know, but you are correct. I found myself either walking down to the very shabby Tesco at Elephant, or walking across the bridge to the more salubrious Covent Garden branch. There are the usual handy Costcutter places, but you pay for their convenience, and there is Iceland on Lower Marsh.
There's nothing wrong with Borough Market, but do you have a stall there or something? How much is a box of washing powder or a load of loo roll there? Which area/planet do you actually live in, where you can exist entirely on organic food products and unusual meats?
There are no supermarkets in Waterloo (yet), though the local shops and market are cheap and cheerful. No butcher close by - have to go towards Borough for nearest. Can easily get a bus to Surrey Quays or Old Kent Road Tescos or Vauxhall Sainsburys.