Hope for the best but consider/prepare for the worst:
Get a Quality life vest I use switlik HV35 with pockets for survival gear\have you done 20:11 with time ex jackets at the local pool? you will be amazed how crap the cheapies are.
Quality life raft, there are lots of crap ones out there that won't stay up the right way in any real waves, you will be horrified by the cost and weight of the good ones.
locate raft so as to readily accessible when needed but not an danger during ditching/impact
Survival gear, water, space blanket, sun hat (dayglo Orange with chinstrap), sun screen, whistle, heliograph, 406 epirb with GPS, HH VHF, strobe light in pockets of jacket, - there are flares and stuff in the raft if its TSO'd
Wear a helmet
know escape procedure, have an 'exit strategy'
Survival rates are very high for ditching if you are prepared, very bad otherwise, blue water ferry the lowest.
Take low GI snack food - dried fruit, nuts, some types of 'muesliu' bars that aren't just full fo 6 types of suger are best, cheese and bikkies, avoid lollies/high sugar snacks. red bull (small can) works as a cup of coffee from time too often, every 3- 4 hrs or so if you want. it makes you pee.
Relief bags (expect the worst) and 1/2 a roll of poo-vouchers, plastic baggies. - watch what you eat prior to departure, easier in the US than asia of course
Walkman
Blue tack
establish a routine - do regular checks, rotate an hour of music with an hour of reading, have small sips of water evry hour and a small snack.
keep an eye and ear on the Big Picture - Nav/GPS/sun/waves/wind clouds/radio and met reps
scrounge the best maps and charts that you can, jepp will do a trip kit for you - for a small fee of course.
A couple of novels - if you are not a big reader and like books with lots of big, bright colourful pictures, disregard all of the above and take a fishing rod and a folding chair
Shipping is much cheaper and safer and the insurance is less. spend your money on petrol when it gets here.
WM2 - getting older does not make anyone smarter neccessarily, it can make you more set in your ways of course. Growing older is mandatory, growing up is optional. how come you are so keen on twins? they're only about 40% less likely to crash than a single, but you are more likely to die if they do, Howard Hughes (the Other howard hughes) had a better idea eight engines mate, that's GOT to the best for overwater, and it was briefly.