Responsing to "How do you intend to fund your studies for the entire duration of your stay in ...?"
Maybe I'm missing something. But if this is a US Ph.D program, this question is really "Do you want us to fund you" and the answer is always yes. As JeffE says, you should not consider entering a Ph.D program unless you're being funded. Apart from the financial constraints this puts on you, the funding creates a commitment (by the department or advisor) to look after you. If the funding is from a research project, then you're even more sure that your work will be linked to something fruitful. 

While there are many caveats to what I just said (and they're ringing in my head right now), they're not relevant at the time of applying to grad school. 

So please always answer "I expect you to fund me".