I found the following information in Chapter Eighteen.
Of the money which, on his first arrival, John had received for his personal expenses, most had been spent on his equipment. Before leaving London he had bought four viscose-woollen blankets, rope and string, nails, glue, a few tools, matches (though he intended in due course to make a fire drill), some pots and pans, two dozen packets of seeds, and ten kilogrammes of wheat flour. "No, not synthetic starch and cotton-waste flour-substitute," he had insisted. "Even though it is more nourishing." But when it came to pan-glandular biscuits and vitaminized beef-surrogate, he had not been able to resist the shopman's persuasion. Looking at the tins now, he bitterly reproached himself for his weakness. Loathesome civilized stuff! He had made up his mind that he would never eat it, even if he were starving. "That'll teach them," he thought vindictively. It would also teach him.
He counted his money. The little that remained would be enough, he hoped, to tide him over the winter. By next spring, his garden would be producing enough to make him independent of the outside world. Meanwhile, there would always be game. He had seen plenty of rabbits, and there were waterfowl on the ponds. He set to work at once to make a bow and arrows.