Machka’s advice is good. Get a bike that has braze-ons for fenders and racks, or get a used bike that has those things. Panniers, front and rear, and a handlebar bag for the things you want on the go. Lights. Really good tires. Cheese, nuts, and dried fruits are you friends. Stop at local markets to get what you need each day, but have a backup if you don’t find any local markets. Two spare tubes and one spare foldable tire, and a patch kit. Frame pump. Credit card, just in case.