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Parker fountain pen
Perhaps the least techy yet most important piece of kit for a writer: a pen. In any occupation you would want the best tools and equipment to do your job. For me, it's a Parker fountain pen, and it's second to none. Refillable with specialized ink cartridges, its precision nib allows me to write for dozens of pages of A4 without thinking twice about changing the ink.
My eyesight has deteriorated ever so slightly over the past few years -- probably something to do with being fixed to a computer monitor or television for more hours of the day than I probably should have done during my teenage years.
These glasses are nothing too fancy and have no branding. The lenses are designed for my shortsightedness which prevents me from seeing things at a distance. During a European Union midday briefing around a year ago, I thought "enough was enough," and would get my eyes checked. Behold, the need to wear glasses; otherwise I can't see a damn thing more than 20 meters away.
If I were to ever end up stranded on a desert island, I would have a near-unlimited supply of ibuprofen. There's nothing worse than being in a foreign country and either not speaking the language or know where you're going with a headache so heavy that it could kill a small elephant.
My personal trouble is that I suffer with Tourette's syndrome. Dozens of times a day, I violently twitch my head which not only strains my neck and back muscles but also often results in an excruciating headache. My cure: ibuprofen, because for some reasons paracetamol doesn't quite take the edge off.