I tried recycling water from the wash. You can only recycle the final rinse. The soap will build up on the soil and eventually form a waterproof scum coating that the plants cannot really live in. It is best to recyle water from your lavatory to flush your toilet and catch the water from the shower in buckets that while you wait for that to come up to temperature. That can be used on the landscape.
People here for years would through the rice washing water on their orchids, and they loved it. You can build an outdoor sink for rinsing only no soap or you would need to put a diverter on it to divert that water to the sewer. Rinse your vegetables in that sink and you could wash your rice there too. That water can be piped through a hose back into the yard. It is not recommended to use gray water in a vegetable garden but ornamentals and grass is fine.
The other thing you could do is build and African key hole garden. It was designed to reuse household water, to water the garden. It even has a built in compost bin. The villages it was intended for had no internal plumbing and the residents have to go down to the river everyday and carry back water for their daily use. the circle is about 6 feet in diameter. Someone figured out that diameter made the best use of the water. If the circle is too large, not enough water gets to to outer part of the circle from the central basket. Wire cages can be used instead of the staves and vines and it will last longer. The original design intended for the garden to be built with materials that were readily available.
https://www.sendacow.org.uk/lessonsfroma ... le-gardens
To make your landscape less thirsty
1. Select less thirsty plants
2. Mulch, mulch, mulch. Keeps weeds down and holds water, but it does suck up a lot of water so install a drip irrigation system under the mulch so you water the soil and not the mulch. Mulch will also help build the soil as it decomposes it will feed the soil organisms that enrich the soil in the long run.
3, Then there are the rain barrels. This works best if you live in an area that gets fairly regular rain throughout the year. Otherwise your rainbarrels will be overflowing when you don't need the water and lay empty when you do. One barrel does not go very far so plan to have a few.
4. You can put a rain garden in your landscape to collect runnoff from rain and hold it in the rain garden and give it a little more time to be absorbed back into the soil rather than run down the street into the storm drain.
https://www.thisoldhouse.com/toh/how-to/ ... 96,00.html
Happy gardening in Hawaii. Gardens are where people grow.