WATER COST WHIZ KIDS - The True Cost of Food - Water Cost and Meal Prep Challenge

Sep 27, 2026

A kids’ water science activity explains the true water cost of food production, linking daily meals to energy and freshwater use. It introduces how water cost varies by food type and shows examples with gallons per serving for meats, proteins, snacks, beverages, fruits, vegetables, grains, pasta, and desserts. Learners then plan meal prep challenges: building water-saving meals, including vegetarian and vegan options with specified water limits, and reflect on how diet changes could reduce future water use.

LanguageEnglish

CategoryHealthcare

FormatPDF

Pages3

Reading Time8 min

AccessFree to download

The True Cost of Food

How Much Water Do We Use?

Water Cost Calculator (Food Table)

Meal Prep Challenge

Connecting With Questions

WATER COST WHIZ KIDS The True Cost of Food Food is great! It's tasty, filling, and we can't live without it. But producing food takes energy and water, uses up land for production, and creates wasteful byproducts. In this activity, we' ll focus on water usage. HOW MUCH WATER DO W E USE? Think about your last meal. How much water do you think was used to produce all the food you ate? The amount of water used to grow food is called the water cost. Water cost varies between different types of food. For example, a pound of beef takes 18,000 gallons of water to produce, and a pound of wheat takes 25 gallons of water to produce. The average person in the United States consumes about 924 gallons worth of food per day, or about 308 gallons per meal. As a country, we consume 30.3 billion gallons of water per day on food alone! The world is covered in water, but only 3 percent of it is fresh water. Unlike saltwater, freshwater is the only typeof water that we can consume and is the water that plants need to grow. When water is used to produce food, it is taken from natural environments like lakes and rivers, which can negatively impact the animals and plants that live there. Practicing water conservation or using less water can minimize water pollution and help us be better equipped to handle droughts. GRADES: K + TIME: 20 min. WHAT YOU ' LL NEED Paper Pen or Pencil Calculator (optional) MEAT Meat needs more water to produce than fruits, vegetables, and grains because animals like cattle and pigs eat large amounts of grain and vegetables before they are slaughtered for their meat. All of the water it takes to produce the food that animals consume contributes to themeat's total water cost. WATER COST CALCULATOR Check out the table below to see how much water it takes to produce different food items. The water cost of each item is based on the recommended serving size. Meat and Protein Beef = 337 gal Chicken = 89 gal Pork = 109 gal 2 Eggs = 99 gal Veggie Burger = 6 gal Hot Dog = 325 gal Bean Burrito = 125 gal Peanut Butter = 15 gal Snacks and Sides Yogurt = 48 gal Popcorn = 20 gal French Fries = 15 gal Slice of Cheese = 56 gal Almonds = 80 gal Crackers = 20 gal Beverages Fruit Juice = 47 gal Milk = 48 gal Soy Milk = 40 gal Soda = 10 gal Water = 0.0625 gal (8 ounces) Coffee = 37 gal Fruits and Vegetables Broccoli = 11 gal Apples= 10 gal Carrots= 6 gal Tomatos = 8 gal Peaches = 46 gal Garden Salad = 15 gal Fruit Salad = 25 gal Avocado = 110 gal Baked Beans = 65 gal Watermelon = 100 gal Vegetable Stir Fry = 45 gal Grains and Pasta Pasta and Tomato Sauce = 55 gal Two Pieces of Bread/Bun = 20 gal Pancakes = 45 gal Tortilla = 20 gal Mac and Cheese = 110 gal Cereal with Milk = 68 gal Lasagna = 135 gal Rice= 25 gal Dessert Cake = 90 gal Cookies = 55 gal Ice Cream = 150 gal Apple Pie = 90 gal Milkshake = 95 gal Flan = 50 gal MEAL PREP CHALLENGE Can you create a water-saving meal? Use the cost calculator on the previous page to put together a meal that meets a water conservation goal. For an extra challenge, complete these challenges without using a calculator. 1. Create a meal that you would enjoy and uses less than 300 gallons of water. This meal must include at least 1 item from each of the six categories. Meat or Protein: Snack or Side: Fruit or Vegetable: Beverage: Grain or Pasta: Dessert: Total cost of Water (in gallons): 2. Create a vegetarian meal ( No meat) that uses less than 200 gallons of water to produce. This meal must include at least 5 items from 5 different categories. Meat or Protein: Snack or Side: Fruit or Vegetable: Beverage: Grain or Pasta: Dessert: Total cost of Water (in gallons): 3. Create a vegan meal ( made with zero animal products) that uses less than 150 gallons of water to produce. This meal must include at least 5 items from 5 different categories. Meat or Protein: Snack or Side: Fruit or Veg

FAQs

What does “water cost” mean in this activity?

Water cost is the amount of water used to grow and produce the food you eat.

Why does meat generally have a higher water cost than fruits, vegetables, and grains?

Animals like cattle and pigs eat large amounts of grain and vegetables before they are slaughtered, so the water used for the animal’s food adds up to meat’s total water cost.

What are the goals for the meal prep challenges?

Create a meal under a specified water limit (less than 300 gallons), and then make vegetarian and vegan meals under tighter limits (less than 200 gallons for vegetarian, less than 150 gallons for vegan) while meeting the required item/category counts.

Sep 27, 2026

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