3 times as many baby wipes as normal. One thing many on my last trip learned was skin problems, lots of people got rashes and super angry skin from sitting wet on boats esp in splash gear. Anti fungals and strong steroid cream. Not otc stuff. Thank god we had a doc. A hard plastic pee bucket. Soft sided ones suck, use small ones that are like 1 gal. I'll look at my list later and update on any more fem stuff. Many more contacts than you think you'll need. I had a problem with mine and wish i had a pair for every 3 days AND rx sunglasses would have been the bomb. Keep a peli with handi essentials, lotion, contacts stuff, spare meds, sunglasses, etc etc thinking of stuff that you may find you need once the boat has rigged (toothbrush is nice there too).
Spare chair (breakage) , spare sleeping pad (even pacos can blow away) for the group.
+1 on both thermoses.
I am a river, babe - I've got plenty of time, I don't know where I'm going, I'm just following the lines..... - "We are water" by Shaye