In your group, make a poster with a message to keep the cooler, tank, drains and the area clean (wherever water collects). Put up your poster in and around your school.
Find out who is responsible for keeping the area around your school clean. Write a letter from your class, reporting your findings and suggestions. Find out to whom the letter should be written and to which office it should be sent.
Disclaimer: This section involves the process of one’s own observation and gathering information. Considering the sustenance of this process, the answer to the question has not been provided.