I guess one of the things about being students is that it requires you to do a little research, rather than just being given the answers! Nice try though!
Corrosion resistant is a good start, I'm guessing you'll also need something that is hygienically stable too so consider that when looking at plastics or metals (hint).
Perhaps you could just watch chef's in a kitchen or your Mother when she prepares meals and see what gets commonly used to get an idea of what might be handy to add to your 'swiss-army' style kitchen multi-tool. Sorry, where was I? My partner is baking a cake and just dropped her whisk and distracted me!
Oh Yeah! Anyway, As I was saying, I really don't think this project is that hard for you and Anna to do. Make 'Google' your friend Grasshopper!