We divided in groups and we made the map of our school. Then, we put the names where we thought that there is secret water that we don´t see, for example they said that in the canteen there is a lot in the food, in the teacher´s kitchen too because they said that there is coffee. Then, they continued saying the library, secretary, the classrooms, the head teacher´s office. Even they realised that the floor is made with a lot of water. The most important of this activity is that they discovered the secret water at school and they know that we have to reduce it.