If you only use water once - Cooking, washing dishes, washing clothes, and showering - then you are wasting an opportunity.
I want to optimize my homestead so I'm looking for ways to reuse my resources. When using water a second time (called greywater - dirty water from washing dishes then goes to the garden irrigation lines) you double the amount of water you have.
The potential problem comes from using soaps that will kill your whole garden. Salts, chemicals etc can kill bacteria and plants and leave you hungry.
Im starting doing research into how to clean my dishes and clothes while still using that water for greywater irrigation under my plants. This is copied from: https://www.thisoldhouse.com/ideas/plant-friendly-soaps-are-safe-greywater-irrigation
There are a variety of vitamins and minerals that your body needs to survive. In a desperate situation, if you are eating and miss out on these, you can die of malnutrition. (That's not good).
If you're planning on living off-grid, think of it as a long term survival scenario. You need to ensure you're getting adequate food, water, rest, shelter, etc. But you also need to break these down and make sure you're getting the right balance of nutrients to sustain yourself long term.
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