Did you know your cooking water is packed with nutrients? It's far better to repurpose it than pour it down the drain.
As a seasoned home economist with over 15 years promoting sustainable kitchen practices, I've long advocated reusing cooking water from pasta, rice, potatoes, vegetables, and eggs. These liquids are rich in vitamins, minerals, and starches leached from food during boiling—valuable assets for health, cleaning, gardening, and more.
To cut waste and eat smarter, here's how to make the most of every drop:
Contents Most of us instinctively pour away cooking water after boiling food. But as experts in nutrition and zero-waste living know, this water captures concentrated vitamins, minerals, and flavors from vegetables, grains, and more.
Next time, place a bowl under your colander to catch this vitamin-rich liquid from veggies or starches.
Rice water is loaded with B vitamins, folic acid, iron, potassium, zinc, and magnesium—especially from white rice. Boiling transfers these into the water, ready for reuse.
If you suffer from nausea, diarrhea, or constipation, rice water's fiber and nutrients can help. It promotes smooth digestion and reduces bloating. Drink 1-3 times daily, sweetened with honey if desired.
Rice water contains para-aminobenzoic acid, a potent antioxidant and anti-inflammatory. It supports internal health and helps regulate fever. Sip 1-3 times a day.
For pregnant or nursing mothers, rice water energizes milk production. Up to 8 cups daily is safe and beneficial.
Apply warm rice water to soften skin, hydrate, and tone. Its antioxidants calm irritation, fight aging, and minimize pores—no toner needed.
A time-tested remedy: Rinse hair with warm rice water. Starch smooths strands, making them silky and manageable. Korean women swear by it for rinses.
Starchy, mineral-rich pasta water (salted or not) shines beyond the pot.
Pour lukewarm salty pasta water at weed bases to kill them with starch and salt. Avoid nearby plants and overuse salt to protect soil biodiversity.
Soak beans, lentils, or chickpeas overnight in pasta water for tender, flavorful, digestible results.
Reserve 250ml pasta water to emulsify pesto for silky sauce that clings beautifully.
Reuse for steaming to lock in nutrients—no fancy equipment required.
Swap tap water for pasta water when simmering soups or broths for instant flavor depth.
Starch makes it a grease-busting detergent for pots, pans, and stuck-on messes.
Minerals in lukewarm pasta water ease swollen, tired feet.
Massage into hair, leave 10 minutes, then shampoo. To discover: What To Do With Pasta Cooking Water? 16 Surprising Uses!
Rich in vitamins from organic veggies (avoid pesticide-laden ones), it's ideal for reuse.
Cooled, unsalted veggie water provides free, mineral-packed hydration.
Nutrients enhance soil fertility; dilute into compost too.
Ditch chemical-laden cubes. Simmer garlic, onions, carrots, leek, parsley, celery in 1L veggie water for 1 hour. Strain, freeze in trays. Reuse veggies in soup.
Rehydrates during diarrhea or aids constipation. Flavor with garlic or ginger.
Store in fridge up to 1 week for daily health boosts.
Dab unsalted white bean water on wool, silk, or cotton stains.
Use spinach water in washes for renewed vibrancy. To discover: My Vegetable Cooking Water, An Ecological Natural Fertilizer.
Eggshell minerals (95% of shell) dissolve into the water—don't discard.
Cool, bottle, and sip within 1 week for protein and mineral recharge.
Calcium-rich; water plants weekly. To discover: What To Do With Egg Cooking Water? Discover the Tip.
Loaded with calcium, vitamins, and starch for myriad uses.
Pour hot water on floors, wait 10 minutes, mop clean.
Soak or wipe cutlery, pewter, and stainless steel.
Target weeds with hot, low-salt starch water.
Remove limescale from dishes and faucets.
Lift tough spots effortlessly.
Apply warm twice weekly; starch and niacin strengthen and shine.
Relax and soothe post-workout. To discover: 4 Potato Cooking Water Uses Everyone Should Know.
Water from simmering bones and carcasses is nutrient-dense.
Simmer bones with herbs; store chilled. Rich in calcium, phosphorus, magnesium.
Use carcass broth: Simmer chicken bones, onions, carrots, turnip, leek, celery, bouquet garni in 1.5L water 1 hour. Defat, freeze. Healthier than store-bought.
