In the desert, you often really don't want to be walking midday, but if the moon is out doing 20 miles in a night isn't too bad, and doing it split over two day

In the desert, you often really don't want to be walking midday, but if the moon is out doing 20 miles in a night isn't too bad, and doing it split over two days is fine. 5 or 6 liters of water plus some food would be plenty, depending on what you have available to carry that ~15 pounds splitting into two days may be more comfortable. Either way, infinitely less risky than building a motorcycle.