Ours is £300 max per month - 1 adult (dairy & gluten free), 2 teenagers (1 dairy free and the other vegetarian) and 2 cats. This covers all food, toiletries, cleaning/washing/toilet rolls etc.
We eat mostly vegetarian (usually vegan), I go to a community food hub once a week (pay £4 and get 2 bags of shopping inc vegetables/fruit), batch cook, meal plan and try not to buy pre packaged snacks. We stick to 3 meals a day with a small pudding and occasional after school snack.
Also utilise olio - last week I picked up a pack of burgers, sausages, loaf of bread, 2 packs of oranges, new potatoes, pret soup (used as a pasta sauce base that night), 2 pret wraps all free. Froze the meat and bread in individual portions and used the pret stuff for dinner that night.
I bulk buy toilet roll, cat food from amazon subscribe & save.
We eat pretty well, This weeks meals are:
Today - Savoury flapjack (using up sorry looking carrots & courgette)
Monday - Lasagne (lentils and sorry looking veg)
Tuesday - Vegetable curry (using up vegetables, potato and will chuck in some lentils)
Wednesday - Bolognase with rice/pasta.
Thursday - Jacket potatoes with beans.
Friday - leftovers!
Saturday - burgers and homemade chips.
Breakfast is cereal/toast/fruit.
Lunch is leftovers/couscous/wraps/sandwiches or I make pizzas using reduced rolls or wraps. The girls will have a couple of biscuits, packet of crisps, some fruit/salad.
Pudding is ice cream, ice lollies, ice poles, meringues for strawberries (when we get them cheap enough!), tinned fruit, or rice pudding.
Snacks - breadsticks with cheese triangles, crackers & butter, toast, fruit, houmous & salad sticks.
Weekends we often have brunch rather than separate breakfast & lunch. One day is usually a fry up (sausages, hash browns, beans & eggs).
We do buy a few different drinks, I get a bottle of squash a week, couple of fruit juice cartons for the girls breakfast, then teabags for me and milkshake powder (not often as it's only dd1 who drinks it). I bulk bought some cherryade/orangeade cans cheap on amazon as its been so hot (around £4 for 24). I have a milk frother so when it's cooler we make hot chocolates/lattes using syrups from tkmaxx. Soya milk is currently the cheapest milk (50p a litre) and froths up really well, lovely & creamy too. Feels like a really indulgent treat on cold evenings, cheaper than Costa etc!