-a larger dry bag to stow the layers as they come off
-small bungee cord(s) to secure the bag and stuff to the kayak
-my water bottle seems to be fine, even have a clip already!
-a whistle (in case I fall in - easier to follow a loud whistle; can't hear a voice over the water sometimes)
-food suitable to the activity (that one was not in her answer, but something I have to do today)
-I've also decided I want to get a little dry camera bag
So, darn, I have to make a trip to REI! (Although I may need to go elsewhere for the pants.)
Photograph from Oregon.com