There's an app you can download called Olio https://play.google.com/store/apps/details?id=com.olioex.android
Where people put up food and other items they don't want/need, usually for free. You just need to go collect. Really nice community, I'm sure you might be able to find some stuff there.
Other than that, like others have said there's always the food bank etc.
Best of luck, hope you manage to find some help.