Rabbit Cage Pet Supplies

I recently obtained the largest rabbit in the world living in a cage for my 2 rabbits and they drink a bottle of water now, but I do not understand how to put it, it isn't a form half-circle with two clips of her as Circe a semi with two long he attached to its really complcated I'll give you a link to the cage,
http://cgi.ebay.co.uk/Hagen-Large-Zoozone-Indoor-Rabbit-Guinea-Pig-Cage_W0QQitemZ260483079478QQcmdZViewItemQQptZUK_Pet_Supplies_Reptiles_Spiders_Insects?hash=item3ca6005d36&_trksid=p3286.c0.m14

More link ebay but I do not know how to get the bottle of water on life and his world are Xone xoo pls help?

um are things were Garte? he isn't poo poisinous to them if it does not fall below or something else?