There are so many ways to do it... Do you need this data for yourself, or you are planning to make a product around it? From what I see you can use Twitter API and Facebook Graph API (Are you comfortable programming?) Most of the students are active on social media so you will find lots of data....
It doesn't look like any of the answers given have actually answered the question you posed -- so I'll do my best: The best place to look is within your OWN personal networks. At the end of the day, a co-founder is very similar to having a husband or wife. Your life will be tied to this perso...
Try mixing the essential oils with the salt or colorant and water before adding to the baking soda or citric acid. If that doesn't work, then you may need to tweak formulation. I am happy to chat by phone through the site if that helps.
It's unlikely that companies would look to outsource such a critical component and also it would be near impossible to create trust around 3rd parties accessing their data especially via an intermediary service.