When I'm at the pools, I turn the shower off whilst I wash my hair (ha, except of course the rinse bit!). Hm, just realised I could do that at home too.

If I use hand soap after the loo, I turn the water off while I lather my hands.

Euca Powder from Mitre10 is great for the garden, grey and septic water safe, good for both top and front loaders, you only use a tidge each wash. Great value for money.