Not really a spoiler because they tell you at the very beginning:
If you can't drink the water or eat the food because they have both been madedeadly, what's the sense of going anywhere?
You can live without food for a while, but you can only go without water for maybe three days. And you're going to push it by riding bicycles?
You can live without food for a while, but you can only go without water for maybe three days. And you're going to push it by riding bicycles?