The human body can survive no more than 3 days without water, even less without coffee. Your continued existence depends on finding it, purifying it and storing it. Look for areas where there are plants, trees, or animal tracks and dig down. Or a river. You can boil whatever you find in anything from a plastic bottle to a paper bag, add a few drops of iodine or bleach to zap any remaining bacteria, and carry it in that condom from your wallet that you had prepped for spring break. Above all, resist the temptation to drink seawater. You’ll only go mad, wear jewellery made from albatrosses, and bore wedding guests.