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I find that tools are over rated on a boat as new as yours. Unless you are qualified or trained to work on a 2015 modern 4 stroke outboard you are likely to do more damage than good. Plugs don't foul on a 4 stroke for no reason and other than light general maintenance there is really no repairs you will be able to make with a limited amount of knowledge or tools that will get you going if you are stranded on the water. I would invest into a Boat U.S membership for 50 bucks or so and take the unlimited on water towing package which costs another 50 bucks or so. Put their number in your phone and get a handheld VHS as they monitor channel 16 and call them if you have difficulties on the water. I learned this the hard way when there were no good Samaritans around and I had to be towed a short distance by a professional on water towing company. The bill was $350.