http://aldi-reviews.blogspot.com/2013/01/cheese-club-macaroni-cheese.html

The Macaroni and Cheese at ALDI is $0.45.
It contains 3 servings per box at 400 calories per serving, so a whole box has 1200 calories.

Macaroni and cheese is not particularly healthy or unhealthy.

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http://aldi-reviews.blogspot.com/2013/01/millville-crispy-oats.html

The Millville Crispy Oats cereal costs $1.69, a serving size is 1 cup, and there are 14 servings in a box.

http://aldi-reviews.blogspot.com/2013/11/friendly-farms-fat-free-skim-milk.html

The milk costs from $1.99 to $2.49 a gallon. The high value will be used. There are 16 cups in a gallon, and 32 half-cups in a gallon.

A serving of the cereal with 1/2 cup of skim milk has 140 calories.

Cereal will be good for fiber and milk is also healthy.

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http://aldi-reviews.blogspot.com/2013/01/nutrition-facts-amount-26-oz-737g.html

The chicken noodle soup is soup is $1.39. A good source of protien.

It has 60 calories per serving and 6 servings per can, so 360 calories per can.

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http://aldi-reviews.blogspot.com/2013/02/seasons-choice-frozen-sweet-peas.html

The sweet peas are $0.95. Vegetables are needed for a balanced diet.

It has 70 calories per serving and 5 servings per bag.

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http://aldi-reviews.blogspot.com/2013/12/pomegranates-at-aldi.html

The pomegranate is $0.69 to $0.89. The high price will be used.

It has 72 calories per serving and 2 servings per pomegranate, so 144 calories per pomegranate.

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Using the accumulated data, a daily meal plan can be devised that both meets the calorie requirement, is reasonably well-rounded, and does not exceed $4.50 per day.

Bowl of cereal: $1.69 per box / 14 servings per box = $0.012/serving
+ a half cup of milk at $0.078 ($2.49 per gallon / 32 half-cups = $0.078/half-cup)

= 140 calories, $0.09

A box of macaroni and cheese: 1200 calories, $0.45

Can of soup: 360 calories, $1.39

3 servings of sweet peas: 210 calories, 3* $0.95 per bag / 5 servings per bag = $0.57

Pomegranate: 144 calories, $0.89
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This totals to 2054 calories, $3.39, with cereal for breakfast, chicken soup/macaroni and cheese for dinner or lunch with sweet peas as a vegetable, and pomegranate as a fruit snack when needed.

Daily requirements multiplied to one week, rounded up:

7 boxes of mac and cheese: $3.15
Box of cereal: $1.69
1 Gallon of milk: $2.49
7 cans of soup: $9.73
5 bags of peas: $4.75
7 pomegranates: $4.83

Total: $26.64, including leftover food at the end in cases such as only 4.2 of the 5 pea bags being used or 7 half-cups of the 32 half-cups of milk being used. Well below the given $31.50.

$4.86 is left over. I could get the ice cream for something nicer to eat at $2.49 http://aldi-reviews.blogspot.com/2013/04/belmont-vanilla-bean-ice-cream.html and some junk food, corn dogs at $2.19 http://aldi-reviews.blogspot.com/2013/04/bremer-corn-dogs.html