Greece has stockpiled enough reserves of fuel and pharmaceutical supplies to withstand a long siege, and has set aside emergency funding to cover all the country's vitally needed food imports.
Yanis Varoufakis, the Greek Finance Minister, said the left-wing Syriza Government was still working on the assumption Europe's creditor powers would return to the negotiating table if the Greek people rejected their demands in a referendum today but it stands ready to fight unless it secures major debt relief.
"Luckily we have six months' stocks of oil and four months' stocks of pharmaceuticals," he told the Daily Telegraph.
Mr Varoufakis said a special five-man committee from the Greek Treasury, the Bank of Greece, the trade unions, and the private banks was working in a "war room" near his office allocating precious reserves for top priorities. Food had been exempted from a de facto import freeze since capital controls were introduced last weekend. Grains, meats, dairy products, and other foodstuffs should be able to enter the country freely, averting a potential disaster as the tourist season kicks off.