If your camping at Waddy, you will be going to Orchid beach shop, as the others are over an hour travel away providing the tides works for you. They dont sell wood and fire isnt guarantee in the area also, dependant on how dry it is.
I would be more concern about bread, milk, and bring all your other meals cryovac, insect spray as the fenced of area is a haven of MOZZIES!!!! BTW bread goes moldy at crazy speed over there, the bright side is the shop sell fresh frozen ones.