Drinks wise you should be ok as there are plenty of taps along the way (First one at QECP then every 10-15miles or so)…have a look here:
http://www.bikedowns.co.uk/Water%20taps.htm
Food wise it depends on you as everyone will be different depending on fitness etc. As 5lab says, starting fuelling up the night before with pasta and the like.
I go for a bit of a range… energy gels (4 or so), crisps, cake, haribo sweets/rowntrees randoms. Personally I find it a struggle to eat stodgy food into a long cycle on a warm day as my mouth dries up regardless of how much I drink so I save the easy stuff like the gels for later in the ride