What you really need to bring in my opinion:
army boots, they will be able to stand the mud
not too many clothes, you ll not be able to change them anyway, and it always gets dirty, mud or sand
buy a waterbottle or something, you can brush your teeth, clean your fase and drink water when it is very hot, better still the water in carton boxes
tent, not too big
sleeping bag
something to sleep on
a few pairs of socks, for if it is rainy and your sock get wet (I hate wet sockes)
ehhh, condoms?????? perhaps not if you re on a honeymoon...........
lol made at wacken..........
something against hangovers would be nice
good luck
Liesbeth