Easily!
For economical food I would buy a 2Kg pack of chicken thigh from Tesco , you get LOADS and I buy these anyway. £5-75. Will do 6 meals for 2.
Freeze in packs of two or three or batch cook a pot of curry / chicken stew casserole. Or roast with root veg and keep some for chicken sandwiches the next day.
500g minced beef - batch cook shepherds pie or chilli
Plan Tuna pasta bake, bolognaise, baked potato, mushroom or cheese omelette with boiled or roast new potatoes, a pasta dish each week.
Pack of pork shoulder steaks - cut up for a stir fry, casserole, kebabs
Picnic sandwiches or rolls - peanut butter, cheese and pickle. Apple / cherry toms.
Home made flapjack - dead easy to make.
Lidl / Aldi ice lollies in the freezer.
£100 for 2 outings in half term, then go to a different place each day, (park / library / riverside / different park) have a friend over. See what's on locally - there are usually some free events.