Wearing a drysuit will give you just that bit more confidence over water. I used to have a checklist handy which said things like, Headsets off. Head cover on, Gloves on, door cracked open, all that sort of stuff and used to go through this with accompanying wife. Be very aware (others will give you details) of what your aircraft will do when it hits the water, for instance there is a good chance that it will nose in and the cockpit will go under the water then bob back etc. I don't fly nowadays but always made a point of being super cautious over any stretch of water. Don't listen to the ones who say that the chances of anything happening are very slim, they are correct - very few small aircraft ditch however that's a lot different than actually being there in mid channel with your heart in your mouth.