As I said, you can run the password safe on your cellphone. It's that portable device you have. You pick the 'phone up, access your private database on it with your master password, and read her the supermarket password. That's if someone hasn't already hacked your account by working out your 'secret method' already.
p.s. If you hadn't lost all your money to crackers, you could be shopping at Waitrose with the rest of us! xx