If you're asking advice for WHAT to draw with, not specifically what we use, I would say use anything. Art is subjective, so you could basically create with anything.
Of course, gluing a bunch of bottle caps to a cork board randomly isn't really art to me...
But strategically gluing the bottle caps to make a cool illustration, that COULD be art...
Whatever you use, as long as you're comfortable with using it, practice to get better! Be it ink, crayon, pencil, paint, or anything else I can't think of at the moment.