If you look up World Water Day (22 March), there are lots of activities suggested to raise awareness of the importance of water.
Water Day Lessons, Worksheets and Activities http://www.teacherplanet.com/resource/waterday.php
Celebrate World Water Day with Games and Activities for Kids http://kidworldcitizen.org/2012/03/22/celebrate-world-water-day-with-games-and-activities-for-all-ages/
Kid Activities | Theme: Water http://www.kidactivities.net/category/Theme-Water.aspx
I would pre-teach a quiz to the children, get them to learn the correct answers for maybe 5 questions and then have them asking the parents the same questions in English, to see if the adults know the answers. Give each child a little clipboard so they are like researchers. Maybe get them to design and colour their own �Water Awareness � badge to wear on the day.
You could choose questions from this quiz:
Water Quiz for Kids - Questions & Answers, Fun Science Trivia http://www.sciencekids.co.nz/quizzes/water.html
