[Shadekeep]

The adventure author really has the freedom to tailor the structure of the adventure in whatever way suits them best, without resorting to new rules. Don't want to incorporate survival aspects like food and water? Let the party travel with a supply train, perhaps gifted to them by the wealthy patron who sent them on this quest. Don't want to deal with travel times? All the locations are connected by a network of gates. An application of imagination will let you create the scenario in the way you want, all while staying within the established rules framework.