The Alternative.in has the following simple tip to save water:

“The biggest culprits in the kitchen are those ever-flowing taps in the city and our tap-happy fingers. Every time we rinse anything under running water, we are using only a third of the water. The rest, is simply flowing unused, into the drains.
So if you are rinsing vessels, veggies – ALWAYS do it with a large container at the bottom of your sink. You can throw away the muckiest water from the first rinse. But the water from the second rinse is not icky and can be used to water your plants, or even mop the floor. We collect at least 20 litres of water from just a morning’s worth of washing and rinsing.

Keep an empty bucket next to your sink. THAT IS ALL YOU NEED TO DO.” – by Anu Gummaraju

I have a few other things I do that are quite simple.

Use a shower (low-flow) or bathe from a bucket with a dipper and use the tub only for the occasional soak.

The rest of the time, the tub is a great place to store water to use in the bathroom so you don’t have to let the taps run.

Tub-water can be used to hand wash clothes, to wash the bathroom floor and sink, to water house-plants, or to flush the toilet.

A nice bonus is that if a tap leaks, you don’t need to repair it right away. You can just just turn off the valve and use water from your tub-tank instead.