you need a sleeping bag and clothes and toothbrush and that's about it, aside from personal nav-ish and chartish gear as you wish or as you think "he won't have this!"
But there are oodles of lifejackets (14) plus 2x dive tanks plus liferafts 2x 6 plus 2xfirsty aid kits and personal strobe beacon things for MOB practice at nite, and on and on.
any other stuf yer might need?
oh yes - Passport !!