I am terrible about groceries and food budget...so I will just kinda think out loud here.
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I figure I spend about $600 a month on all things consumable (including paper products and dog food and kitty litter etc...and I figure all of that is about $100 a month) Â That leaves me $500 for food and there are 4 of us and an occasional guest. Â
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So for breakfast they usually eat a piece of fruit, toast or cereal.  We will budget for cereal since it is the most expensive.  Almond milk is about $3 a carton and a box of cereal is about $2.50.   So  $8 a week for three girls.  I usually have a protein bar or left overs so that's about $6 a week for me.   So breakfast comes out to about $14 a week or $2 a day or $.50 per person a day.
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Lunch:Â
girls get a sandwhich...usually p b and j. Â an apple. Â something crunchy and sweet. Â and a veg.
 So a loaf of bread and a jar of pb and jelly, 15# of apples, a box of cookies or granola bars, and a couple pounds of baby carrots (right now they take cucumbers or cherry tomatoes which are free). Â
     $2.50              $5     $2      $15             $5                           $2  = about $30 or $10 a week each girl or about $1.50 a day
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i suck and spend about $4 a day at work but eat leftovers on my days off. Â So $20 or average about $3 a day which brings our daily lunch total to $4.50
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Supper is our most expensive meal. Â I get a good deal on meat at work. Â The all natural angus roast in the pot right now was $1 per pound (heck yeah!!!) Â I added a little bullion and onion soup mix to cover up the freezer burn (yeah well....) and some celery tops and carrots. Â So $3 for the meat and about $.50 worth of carrots. Â $1 for the seasonings. Â Potatoes will be about $2 and I will serve some sliced tomatos and cucumbers with it and perhaps some fried zucchini (veggies from the garden)...so maybe $.25 for oil. Â total for awesome supper that does not happen often is $6.75 and this is a big dinner! Â I only cook like this maybe 1 time a week. Â but we will go with it because it i the most I will spend on a meal if I actually plan a little. Â Â
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Bottom would be speghetti or chili or soup. Â average cost is about $4 for the meal if it includes salad or bread. Â So average I would say $6 per night.
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and of course it would be silly not to figure in snacks, treats etc....so lets just say we spend $3 a day on that stuff.
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that brings us to $14 a day....or about $100 a week. Â or about $450 a month. Â Plus there is the occasional celebrations, snacks for teams and classes etc. Â
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There are four of us and my kids ages are 8, 11, and 15. Â So everyone is eating adult portions.