I would not recommend trying this. People are not good at surviving at sea for much more than a few days.
You'll need:
Fresh water. Drinking salt water will kill you. Desalination is tricky, unless you have the right gear. Cisterns and solar evaporators do work, and you can find plans for them... but don't depend on them without some sort of backup. They both require certain conditions to work.
Food. Not eating will kill you. This can be very tricky. There aren't just fish swimming around just under the surface for you to go and catch most of the time, and you definitely should not eat what you get out of the sea without cooking it first. You can certainly survive this way, but most recent shipwreck survival cases HAVE also ended up coming back (or being recovered) with MASSIVE parasitic infections afterward. Like, the writhing clumps of worms kind of parasitic infections. Nobody wants that.
Shelter. The sun won't necessarily kill you in 100 days, but it will cause all sorts of damage to your skin and your eyes. If shelter isn't an option, UV-reflective clothing, sunglasses and lots of sunscreen. It also gets very cold out there at night, so be ready for low temperatures too. Even in the summer. Shelter will also help you dry out when you inevitably get soaked. It's just a fact of life.
Wooden boats aren't necessarily much better or worse than other sorts of boats. Having a motor or sail would help. I guess wooden debris can float better than certain metal debris, but foam would probably be better if you're actually thinking about that. At least in the short term.
