"sdean" wrote in message
...

I am clueless as regards gardening. I'd like to re-use some of our
household water to water the grass. I've read about bathwater, washing
machine water and dishwater, but can cups of tea or coffee that have
gone cold, fruit squashes and juices that have been half drunk, and the
water from cooking be used on the lawn or on patio pots? Or would that
harm the plants?

bathwater, washing machine water, dish wahser water are all ok. Do a google
search under 'grey water' and you will find untold websites going into great
detail. As long as you use a nice bio-degradable detergent or powder you
should be fine. I have heard that anti-bacterial soaps can damage
micro-orgamisms in the soil so perhaps give them a miss if reusing the grey
water on the soil.
Cooking water should be fine on potted plants. Water you boil the veges in
should be fine as long as it is used cold. Water left in the soak a pan with
potato or rice is also ok, just strain out any food waste before you do.
Fruit juices should also be ok, we drink the stuff so it should be fine for
plants. If the juice has a lot of pulp dilute it.

rob