Hoping to get some advice. We're going travelling in October this year, we'll be backpacking and accommodation will mostly be camping. What amount of money per destination do people think we'll need?

Hong Kong - short stay maybe 1 week.
OZ - 5 months
NZ - 3 months
S.America - 6 weeks (we've organised a tour for this but will still need to pay for food).

Any help would be appreciated!