A raft but no jacket assumes you will be able to step off the wing into the raft
And a raft, a survival suit, a jacket (for good measure), and no training means you might as well leave it all in the hangar, it's going to be that much use.
I don't mean to sound harsh, but I feel a false sense of safety is worse than no safety at all, so please do get some proper training on how to use your gear. This could be a nice course for AOPA, PPL-IR, and similar associations to run, actually.