made a similar move myself, a couple years ago, except to a class C from a pup
the dealer through in a cheap sewer hose like this one, and I'm still using it.
http://www.campingworld.com/shopping/item/ez-coupler-bayonet-sewer-kit-20/27864
I bought i additional segment I think the same length, but have only used it maybe once. 94.8% of the time I get by with one segments (like most numbers on the internet, that one was made up on the spot
)
there are better ones, but this has worked fine for a few years now....
if your pup had a sink you'll probably already have a potable water hose, if not you'll need one of those. Don't use a regular garden hose.
Beyond that don't go hog wild getting stuff. take a notebook along on the first trip or two for notes, and head to walmart as you think of stuff you need. Shouldn't be much....
oh my one suggestion is power adapters....commonly called "dog bone" connectors.... a short piece of extention cord wire with connectors on each end
Mine is a 30 amp service, so I use the 30 Amp to 50 amp one quite a lot....
http://www.tractorsupply.com/tsc/product/camco-50m-30f-amp-18-in-dogbone-adapter-with-powergrip-handles-1060486?cm_mmc=feed-_-GoogleShopping-_-Product-_-1060486&gclid=Cj0KEQjwhpnGBRDKpY-My9rdutABEiQAWNcslCsz4AX1N4jBuDwYaVEJEWMOoFSrWauqgwpVJC2bt2EaAvKh8P8HAQ
the 30 amp outlets in CG's are used hard and sometimes you'll come across some that are worn out or damaged.... also use a 30 amp to 20 amp to plug into a regular outlet at my house....