Good things for the second rocket include: The seat, t.p. hand sanitizer, gloves, possibly handy wipes for cleaning the seat ( make sure there is some sort of trash receptacle for these, they will clog the hose) groover deodorant?
Open the small cap first, that the drain hose connects to, and screw that on first. Remove the tiny cap which the garden hose connects to second, ALWAYS second( the pressure can blow shit in your face, ask me how I know!) connect the garden hose with the supplied fitting. Dump the groover, turn on the hose SLOWLY, turn up to full pressure nice and easy, and let the water blast the crap out of it.
Store the drain house in the plastic jar usually provided.
I have been liking some wood ash in place of deodorant when practical, does a better job I think, requires a dry groover, ad water on the last day to make a nice "poo stew".
Should be able to find ton's of highly opinionated advice on groover care by doing a search.
Oh, and don't put off dumping, then who knows how long you will end up waiting, you'll be planning a trip and realize you have a shit slushy in there!
We can't always agree, but we can still be civil to each other.