Can you find cheap produce? Any good farmers markets, wild growing, tropical fruits? Sunny and hot November - February? Nice wwoof farms, hostels, work exchanges, seasonal jobs and what's required if staying 3-6 months besides visa and passport?
Hi Northland is very warm/mild, winterless north. You should be able to find cheap produce. I can't imagine it being a problem. I've never been a backpacker here so don't really know the answer to any of your questions.