When we go to Fraser we usually beach camp in the Marloo area Zone 8, personally I like to stay north of Indian head as the tourist bus's and the backpacker crowd don't go up that far. It is much more quiet. Once set up there you are only a short drive from Orchid Beach where you can get the essentials if needed, and there is fresh water as well as toilets and hot showers at Waddy Point.
Only downsides of camping up that way is that you are a long way from the attractions, and depending on the tides it can take 3+ hours to get up there.