Instead of taking a bath why not take a shower? You could save 45 litre's of water each time. That's the same as 45 cartons of milk.
When you wash your teeth don't leave the tap running and use a mug or glass of water to rinse your teeth.
When you wash your hand's make sure the plug is in and don`t leave the tap running.
When you are washing up, don't use a running tap instead use a wash hand basin. Don`t rinse your vegetables under a running tap, wash them in a bowl of water.
When you use a washing machine or dishwasher try to use a full load, as the dishwasher or washing machine will use the same amount of water whether it is a full load or not.