Wow.. I live on my own, and I spend more than £1 pound a day on non alcoholic drinks a day, let alone food.
It's a real pain living in your own when it comes to food. I enjoy cooking but cooking for one most nights is a pain. Normally I don't eat breakfast as its always made me feel ill, I have a meal at work; I work in a college and have a school dinner. Then when it comes to tea if I'm not cooking, I'm calling a take away. I'm not a fan of the ready meals, I guess I'm rubbish at planning my meals, defrosting stuff ready.
A lot of the fruit and vegs I get end up in the bin or in my hamster cage, supermarkets don't really cater for people living on their own, tesco had an offer 3 for 2 in 500g grapes. How in gods kitchen am I going to eat that much grapes before they go off!
Any how, good luck to the OP.. I don't tend to look a the prices when food shopping but to me that's an impossible task.