Wasting water isn’t saying that it’s destroyed. It’s often that it gets converted into a state where it can’t readily be used again.
Like if you leave the tap on when you brush your teeth, the water goes to the waste water treatment plant where it needs to be actively treated to make it not toxic to wherever they release it or treat it more for reuse. If you wash your car excessively, it ends up in the storm drain with all the street drain water, which may or may not be reusable without extensive filtering. If you water your field excessively, most of that water evaporates, where it will condense eventually, but might do so a state or so over where they aren’t short on water.
You’re not so much wasting water, you’re wasting the transportation and filtering it takes to get that water to you, or back to nature responsibly.
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