My guy has done RAIN several times, and is encouraging me to ride it this coming year as well.

Gatorade and Powerade are all but poison to me--that much HFCS blocks nutrient uptake something fierce, and the stuff feels like thick slime going down. Hammer Nutrition's HEED and Perpetuem are far better fuels. If you don't have someone doing the personal sag vehicle thing for you, pack sandwich bags of powder mix pre-measured for your bottles, fill your bottles with water and powder at each stop, and move on.

Yes, you can do it. You will want to prepare for it, but you can do it.