There are 'pit stops' along the way, giving free juice.
Public toilets and porta loos are available too, however they are placed in built up areas so tend to be busy.
We took our own provisions with us sandwiches, fruit and plenty of bottled water, initially our back packs are heavy but we off load on route. We learned to wear light trousers and not jeans as if jeans get wet they dont dry, There are buses laid on at the end but I think you have to pre book, the queue for the buses are long, the easiest way to get home is ask a friend to pick you up, we arrange our lifts at the cottage loaf Pub
because the road down to the visitor centre is really busy. All in all its a good day, very tiring if you can book a days holiday on the Monday is a bonus, because if like me you will be really stiff and I walk regularly.