As far as I can recall, I am unaware of any supermarket chains that accept BTC as a payment method. Having been said, there are ways in which you could still use your BTC to pay in said stores.
There are numerous debit cards around that are either linked to Bitcoin wallets or that are able to be loaded using your BTC balance. The balance is then converted at the current exchange rate to a total in FIAT which is then spendable in store. Its not ideal but still better than nothing.