http://www.sydneyessential.com.au/essential-guides/native-fruits
Seriously just look for guides like this and go out and look.
I currently have a pick of hundreds of blue berry bushes and black raspberry's around my house plus other stuff I did the research.
I have good general knowledge on what is edible here and where to get it, however I'm saving those bitter red sand dune bananas until I'm close to death, they taste like pure forget.
You're really all alone?
How is that even possible?
I live with my sister, brother and his girlfriend, my parents are still overseas and my sister has gone to bali, bro and his gf have gone up north for a week.
Go to the forest and for.. "Western Australia" buckle down the hatches, board the windows, nail the door shut and hide.
Edit: In all seriousness go foraging there is most likely a guide online for your area.
I don't need no guides! No but really if it comes to it I'll embrace my inner bushman, hell my dad survived in the outback for 6 months straight with nothing but a knife (that's right, he was naked)
order a $5 footlong from subway with everything on it and tons of sweet onion sauce - you will loving mouth climax i swear
Don't think they would really deliver out here, and I'd have to kill the delivery boy so I didn't have to pay but I'm fine with that part.
Then vomit up your guts and die on the floor.
It was sounding good up until that point...
Clone. Look for any remaining food in the house. Ill think of something you can make. Maybe you will find your wallet too.
Have been looking for days, not a single ingredient is left unless you include tea bags.