I don't do stations as often as I'd like. I've got great students, but I only have them for 30 minutes (ugh...way too short a time). Bless their hearts, we usually end up rotating to only two or three stations.
However, this is a short activity that the students have used successfully in stations before.
All you need is:
1. Copies of the worksheet for each student
2. Pencils/markers for each student
3. Styrofoam cups (see picture below - I used three, but you could do four)