Two things come to mind. My brother and I used to play in the boat pretending to be stranded. We ate dog biscuits because they were our 'rations'.
Second - I spent a lot of time in the bush holidaying as a kid. My brother and I (he's the bad influence - not me!! I swear!!) found some tadpoles. We built a fire and found an old tin and put the sliced up tadpoles into the boiling water with a turnip we stole from the garden - seems we were trying to make some type of soup. I don't recall whether I actually ate it, but I know the intention was to eat it. Perhaps I've blocked that from my memory....I also cannot eat turnips now under any circumstances.