Something that my family would often do is to save any water used in the kitchen and reuse it at least once. We eat a lot of vegetables, and with vegetables comes multiple washes to remove the dirt and the occasional dead insect trapped in the leaves, so the water used to wash them, or to blanch them, builds up. Because water can be expensive, we would collect all of the used kitchen water and use it to water our garden (but it can also be used to flush the toilet!). I can’t attest to how much our water bill actually changed with this practice, but I still recommend it if conditions allow because it seems to have increased the harvests from our fruit trees.
Now that I live in an apartment with limited places to store buckets of water and even more limited access to a garden, it has become difficult to reuse all of the water from cooking. Nevertheless the practice of trying to reuse sticks; I find myself using vegetable washing water to soak a dirty pot rather than just pouring it down the drain, or otherwise being more conscientious about water use in general.