Kidneys don’t “take a break”, they’re not designed to. They filter toxins and waste chemicals out of your blood all the time / continuously. Having enough water (goes from your stomach into your blood) makes the job of the kidneys easier, because filtering toxins out requires water (to dissolve the toxins and carry them away).
There is such a thing as an overdose of water, but we can handle quite a bit actually before reaching that point, so most of the time the advice is to “drink plenty”.
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