And what about restocking? Or do you pack for 20 days? How about sleeping/camping for 20 days, do you just come ashore and camp? Sleep on the boat? What have the past racers done?
You can be resupplied at official checkpoints, using outside support. Mostly you just stop and camp whever you think you can avoid being harassed. You actually can stop and eat in a restaurant or stay in a motel, but that slows you down.