You've had some great advice so far but re bills I'd like to know exactly what you've done to get those as low as possible? It's not just shopping around/switching it's also reducing usage (eg lower thermostat and on for fewer hours in the day and dressing more warmly at home, eg you shouldn't need heating on at night once in bed, plus you could do things like get an electric blanket) and using cashback sites or credit card (paid off IN FULL every month - as per Martin Lewis guidelines)
Mse is a great site for money saving tips I think you'll find the old school forum particularly helpful
I now use the "nest egg" app to keep an inventory of all food and drink and you can record expiry dates on it too and set the alerts re expiry dates to suit you. Even if you only use it for short life products I'm sure it would help a lot. You can also create your own categories so you can assess how many meals worth of food you have in - that's what I've done.
Remember to regularly rotate food to minimise waste inc tinned goods. These have a long date but you still want to keep on top of things.
We always have a lot of random stuff in the fridge left over and often things going out of date (a big waste!!)
Exactly which foods do these tend to be? Vegetables can be used in soups/curries/stews/casseroles if still safe to use but past their best
Soup is dead easy to make and great for using up odds and ends. My basic "go to" method is sauté onions, garlic and any veg (diced) that is improved taste wise by sautéing, then add however much stock for how much you want to make, I usually use 2 pints boiled water and 3 stock cubes, then add whatever other diced veggies you're wanting/needing to use up, bring to the boil then reduce to a simmer and cook until the slowest cooking veg is soft and fully cooked. I have to allow to cool as my blender isn't designed to cope with hot liquids and I like my soup blended. Once cooled I blend and freeze with date frozen marked on container. I aim to use it up within 1-3months at most.
I'm veggie so the meat eaters will need to advise on using meat safely in soup.