Spark plugs, basic tools, zip-ties, electrical tape, a rag, and some rubber gloves. (maybe a couple hose clamps)
Anything more than that... and I'm going to do the work in garage.
Also... an extra RAVE is bordering silly. If you have a RAVE die... there's a chance that it fell into the engine, and eat itself. I guess if you want to keep a piston/bellows and a cap... that's OK. But here again, if you melt those parts... there is a bigger problem, that isn't going to get fixed on the water.