Here's a good one. It's called, "How does the sugar concentration vary in different brands of apple juices?" Here's the link:
Http://all-science-fair-projects.com/science_fair_projects/39/873/484f1bc086be3f022ee37037f98ae9c7.html
Http://all-science-fair-projects.com/science_fair_projects/39/873/484f1bc086be3f022ee37037f98ae9c7.html