I don't fancy carrying a camelbak 4 100miles either, so going for 1L bottle on bike and carry a spare 500ml in back pocket. With food drops, we only have to carry enough food for each leg (25miles), then can pick up supplies. Tube, multitool and spares carried under seat. Gillet/waterproof/pump/mp3 in jersey pocket. Easy as!
Anybody know why the last leg is so long without a water stop, seems odd to have very frequent watering holes then have a big gap for 25 miles at the end when you're gonna slow and thirsty.