Dissertations / Masters in Food / Beverage Science candidate and don't know where to start / topic [4]

I don't have the best adviser and I'm having difficulty finding someone in my food science department to take me in to work on my thesis (apparently my adviser stepped on a few toes and burned bridges). This is my 3rd semester and I have no idea how to start a thesis or even think of an idea. I'll do anything at this point. I work in a QC/QA food micro lab and I wouldn't mind doing something there. I guess my questions are:

1. How do you pick a topic
2. How do you get the data to write?

Thank you.