I've always got in my fridge -
Cartons of fresh soup, like carrot coriander, chicken sweetcorn
Slices of pure cheese, not processed
Ham
Boiled eggs
Individual pots of yoghurt
Individual fruit portions like apples, strawberries, bananas
Cartons of innocent smoothies in different fruit blends
Vegetable juice
And in freezer I've got
Sweet potato wedges
Potato wedges
Jacket potatoes prepared and frozen
Microwave frozen brown rice
Fish fingers
Sliced wholemeal bread
And in cupboard
Baked beans
Tinned fish
Condiments and pickles
So, when the munchies strike, I could do various combinations out of these, like -
Jacket tatty in microwave for five minutes, with beans and cheese
Sandwich with cheese, ham or fish fingers
Brown rice microwaved for couple minutes or tatties with tinned fish
Mug of fresh soup from innocent
Glass of smoothie
Chopped apples with pot of yoghurt and honey
You'll find these supplies in fridge actually even make up good lunches, and none of them will leave you feeling guilty because they pack fibre and protein in them and count towards your calcium or fruit and veg counts.