You will have lots of ideas about how people could save water, but will you be able to change anyone's behaviour? Here are some things you could try.
Have a meeting with other YSAs to see what ideas you have.
Arrange a meeting with your headteacher. Make sure you prepare well, and can tell them how much water they could save and how much money that would save the school.
You could write a letter to parents about saving water.
You could write and distribute a leaflet containing water saving tips.