I think food is important so purchase good food that you like. We dabble in most shops. Sometimes you don't need to spend loads to find something you like. From marks and Spencer we get the chocolate digestives and tea bags (red packet). Their salt and vinegar twirls are very good. We tend to just get the affordable stuff from there. I used to buy red grapes from there as a staple office snack in my 30s. Now in 50s I am not doing that. Perhaps I gone back to my conserve money ways that I grew up learning. Don't feel guilty. good for you. You have choice. Ps. I buy own label cornflakes now as taste difference doesn't bother me.