Join Camping World Presidents Club (10% off) or Good Sams Club (10% off at CW) then walk the isles with 2 shopping cards or better yet go to Walmart SuperStore and check the RV stuff first.
Ask questions here first if you are buying tire locks to stablize the two tires, Get good quality sewer hose and adapters (check Walmart first) buy the cheapest dblank tank digester in small packets (Walmart) Go to 98 cents store and buy plastic plates and utensil as well as plastic storage containers for inside all the kitchen cabinets to hold stuff in place. Do not buy glass but plastic stuff that won't break. Buy the cheapest 2 ply toilet paper that will desolve in water. Test at home first.
These are only a few suggestions.
Oh buy some high temp grease for your wheel bearings if you have the zert fittings on each wheel. Get a good tire pressure guage and make sure your tires are at 55psi always or whatever it says on yours.