In my opinion, you should first state to whom those questions are dedicated.

" eat out " ? what are homeless people supposed to answer ?
" in US $ " ? it seems that a restaurant in Vietnam is, in average term, 6 times less expensive than in Denmark. How do you take this into account ?

You make valid points, however, putting into account that I doubt homeless people have access to Internet, let alone this survey, I didn't think about it. I will have to include that in my research proposal though. Thanks for the heads up, brother.