Little questions are fab, crack on! it gives us a chance to think about and glastobate a bit more, and thats always a good thing! There's a couple of urns in the oxfield, hot water is always available - you really dont need to bring a little stove. There's room for everyone to camp, you might be a bit nearer the gate or a pylon or the loos than youd ideally like to be, but everyone will get in.
In terms of snacks: well. I tend to get loads of nuts, cos i like em. Stroopwaffels are great with a tea (and as above, you can always have a tea, there's hot water) and cereal bars are quite hardy. I also quite like a pot noodle, but i get a tin of mackerel fillets in tomato sauce and smush them in and around - makes it almost approaching edible. I take loads of fruit as well, and the caterers in the Oxfield arent bad, you'll get three food tokens but they also sell food, and last year had late night pizzas and coffee etc for sale.
one bit of advice - bring a plastic/melamine plate and a knife and fork, it saves time/money/facilities