Pete when I was in Miami I did LOTS of distance sailing uni-rigged. Let me tell you, after the first hour you start talking to yourself. Its not a lot of fun, keep that in mind.

As as water tubes etc, instead of adding another leaking point to your hulls and you do not want to carry a camelback maybe you can attach it to the center forward section of the trampoline.

If you are serious about distance racing maybe you should try a few smaller races before jumping into 50+ mile races.

Its kinda scary flipping in six foot seas in open ocean by yourself, been there done that and I really do not care for it anymore.