Use water from boiling vegetables to water your plants:

You’re reusing water and the nutrients that have leeched from the veggies will feed your plants. Just let it cool first to avoid shocking the roots. Water from cooking pasta and potatoes can also be beneficial to plants.

Use hard-boiled egg water to water your plants:

Eggshells are rich in calcium, which helps to neutralize the pH in soil. When you hard-boil eggs, a bit of the calcium ends up in the water, so your plants might love it. Plus, you’re doing something useful with water you’d just be throwing down the drain.