Before they had left for the sporting goods section Brayden would have informed Robin about her boat. It has both an ethanol engine and a modified sail system, one that Brayden insists only it to be repaired with silk fabric, which she has plenty of. The best way to help power the boat is ruffage from around wherever they'll go, which she can turn into ethanol in a still she has on her boat. Gasoline also works just fine. Nothing else for the boat is required, though she does mention needing some books and forms of entertainment. Entertainment in post apocalyptia, at least to Brayden, is a key form of keeping insanity at bay.