1) Taking a 10 minute shower saves about 1/3 of the water over taking a full bath.
2) Install a Dual Flush Toilet which has 2 separate buttons for liquids or solids. This toilet can save about 200 gallons of water a year.
3) Invest in a Grey Water Systems that reuses water from your bathroom sink to flush the toilet. You can save 40% of fresh water used.
Saving water with good bath design.