Whats a good efficient way to organise data?

I am having a petition at my school to change the lunch menu so that it offers equal amounts to vegetarians, as well as non vegetarians. I am having a signed petition go around, but I am also taking the advice of my teacher. For the next month I will be taking down everything offered in my lunch room that is included in the normal meal deal lunch. And I need to prove that these options are not valid enough to be a balanced nutritional lunch for vegetarians. I started collecting the data but I am not sure how to organise, and present it in a well rounded rhetorical manner. In order to reach the petitions goals.