Ekiam,
Don't wish to discourage you, mate, but projects about fitting skis (I assume you mean skis
) won't really do it. Even if theoretically feasible, skis (or floats) would be too expensive and too big. Just look at the size of floats fitted to some single engined Cessnas.
How about looking at issues such as passenger smoke hoods? More passengers have died as a result of smoke inhalation than drowning post-ditching (and there have not been many ditchings, at least not survivable ditchings)