Resolve to leave the civilized world behind. You are a danger to yourself and others.
But first, stop for supplies.
Find a sporting and/or outdoor goods store. Avoid eye contact and conversation with any of the shop’s staff or your fellow customers – head down and hooded at all times.
Fill your cart with trail mix. Also: a tent, a sleeping bag, an emergency radio, water purification tablets, eight pairs of socks, eight pairs of underwear, three changes of clothes, hiking boots, a sun hat, a camp stove, a lantern, a compass, a hunting knife, a multi-tool, duct tape, climbing ropes, sunscreen, various toiletries, and a backpack (or two) to hold everything...