Not a bad idea, but I have visions of it getting really moldy and needing frequent washings of its own . . . which would then just use more water.

The removable sink would be great for those of us in Alaska without running water! Many folks in my area have a regular stainless or ceramic basin, sans faucets--the water is poured out of a 5 gallon jug with a spigot. The water then drains into a 5-gallon slop bucket under the sink.

I think that the sink would be more manageable. I'd be more likely to use one "sink" of gray water on plants & trees, rather than let all of the water mix in my 5 gallon bucket for the day...some of which may have greasy food particles or too much vinegar & soap for plants.

i like the idea. in parts of australia we have been on heavy water restrictions (no sprinkling of gardens, only watering plants and washing cars using buckets, encouraging 4 min showers).

gray water is kind of iffy, mostly recommended for ornamental plants and nothing that you are going to consume.

Its a great idea but why not just use a good old fashioned dish pan?