Advice for keeping crickets? ten points for best answer?

I'm doing a science project on the effects of perfume on crickets and i need to know how i can keep them separated and living long enough for my project to be complete. If I keep them in plastic cups and put saran wrap taped to the top, will they live a few days or do i need to put small holes for air? help please! id appreciate any extra advice or other suggestions on how to contain them. ten points best answer!