Hi,
if we were fully stocked up, we would have enough food in the fridge / freezer for 21 days of normal eating with another 5-10 days in cans. But rationed, we could probably stretch it to 40 to 50 days.
Two bottles of gas would keep the fridge going for 50 days.
We have about 100l of fresh water and if only used for drinking and cooking would last about 30 days.
All cooking would be done on the chippy which would be used for damper and bread. We normally carry 2kg of plain flour and 2kg of S/R flour.
That means we have to first find a reliable way to get fresh drinkable water within 30 days.
Then we have to find food within 50 days. Not sure I have the ability to catch animals and, since I don't go fishing, we would not have rods etc.
So I would say our chances of catching fish would be pretty slim. But I would have 50 days to learn.
All washing etc would have to be done in the sea or a stream, lake, lagoon.
Another slightly different variant we have often done on backpacking trips. You go to bed in a perfectly normal world. You wake up in the morning and you are the only person left alive. What are your priorities for staying alive as long as possible? This has often kept the group busy for days.
How long would electricity, gas, tap water last. How long will petrol, diesel stay usable. How long could you keep generating electricity to keep deep freezers and refrigerators running? (This was originally way before solar was a viable option).
take care
Mike