I would recommend taking some water definitely, 1hr cross races are different.
For me, 1 500ml water bottle (usually not quite full) per 25 minute lap, get someone to hand you a fresh one each lap. I use Zym tablets for racing, or High 5 with some Elete water. I very rarely finish a bottle on a lap.
If you only have a Camelbak then 1 litre will be fine.
Edit: for one long lap, I'd still personally carry one big (750ml) bottle, you'd probably be fine with 1 litre, do you normally drink a lot?
It's only going to be 90 mins or so, you don't really need to eat anything, maybe a gel if you feel you're flagging, I wouldn't bother with Jelly Babies or anything. You should be trying too hard to be able to chew anything.