Have fun ladies. Will be thinking about you all (with a wee bit of envy in my heart).
Good luck! Don't worry about taking lots of water with you. Lots of water along the route. Try to use the loo before it's time to set off. The portaloos have huge queues all the way along the route. Take some antibacterial hand wash if you can. Nowhere to wash your hands (unless you use your bottled water).