Yeah, I'm astonished at people washing things after one wear too. I don't put clothes-I-have-just-worn back in the wardrobe, I hang them over the end of my bed, so that I know that they've been worn and may need to be checked before wearing again. Except undies and socks, they always go in the laundry basket after one wear.

I treat my garden with benign neglect most of the time; unless we ARE in a drought (in which case, water is likely to be rationed anyway). I don't water my plants; if they live they live, if they die then that's just natural selection, hmmm?

I have not done any calculations as to which method of washing a human or washing dishes uses less water, and I'm not likely to, since it would be too difficult for me to change my routines for those.