Stop eating outside, cooking your food is a better option than going outside. If you're a family and you've got a limited budget, that's one lifesaver that one has to remember. Obviously, that's what gonna work for a family that's consuming food because you'll not even be able to afford to eat outside because of how expensive food is nowadays. And do not settle that you're just the sole provider to the family if there are some of you that can work just as you, you need to convince them that they also need to work and provide for everyone.
Also if you have leftover food that you can still use like reheat and to add, like for hams that can go along to anything like sandwich and part of the recipe. I think that way you can also saved up money, cause my mother is good at recooking foods that could last for a week. Whenever you're going to grocery, always have a list to follow cause for sure you would see everything that will led you to buy as well the unnecessary things.
Don't also forget the discounts like the buy one take one, it's actually also good as saver, cause I always buy a lot to have stock at home with the same price but double product so it's a win situation. Well, I started to give some money for the needs in the house early at 16, any part time and side hustles would do as long as it's legal.
Bargaining too, if you're the one does the groceries and buying it in market, not supermarket, you can also bargain with a few bucks from the total amount of your purchase which we usually do too aside from the discounts. 
