What are your favorite tools/instruments? In other words, if you were stuck on an island with an endless number of notebooks what supplies couldn’t you live without?

Anonymous: What are your favorite tools/instruments? In other words, if you were stuck on an island with an endless number of notebooks what supplies couldn't you live without?
Answer: If I’m stranded on an island, assuming I have no electricity, I would be very happy with an HB pencil, kneaded eraser, mechanical eraser, and size .03, .05, .08, 1, and 3 Microns. If I have an extra hand to carry stuff, then throw in a portable watercolor set with india ink and a nib pen.