Try taking a refreshing shower instead of a bath. A shower uses 2-3 times less water than a bath. This can save up to 400 litres of water per week. But remember - power showers can use more water than a bath in less than 5 minutes.

If you do have a bath, you can save water and energy by ensuring it is not overfull.

"Brushing your teeth with the tap running
wastes between 5 and 9 litres a minute"

Don't leave water running while you clean your teeth. Rinse out from a tumbler instead.
Use plugs in washbasins when you have a wash, or are cleaning the bathroom, rather than leaving the tap running.

Toilets are one of the largest users of water at home. Most toilets plumbed before 1993 can use as much as 9 litres of clean water every flush. Toilets installed after 1993 will probably have a 7.5 litre cistern.

"Use the shorter flush on your dual flush cistern"

When you are installing a new bathroom, chose water efficient taps and dual flush cisterns.
If you have a dual flush cistern already, use the shorter flush whenever possible.