When your washing your hair, turn off the shower etc. while you soap up your hair. I water my plants with the water I have boiled my vegetables in for dinner. If I only have a small load of washing to do, like my most intimates, I just put them in my sink with some hot water, instead of using a full cycle wash on my washer then when Ive washed my intimates, I use that water for plants. If my freezer needs defrosting or has loads of ice, I put all the ice from that into a bowl and use that water instead.