Outfit: Lunar Champ A531
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Have you had a look in camping shops, Halfords and places like Towsure? You can buy drinks holders that clip onto the window frame, like a thin hook that slides down where the glass goes down. In ours, the deep door pockets have a place for a large bottle, but I'm assuming you mean more for something like a can or smaller bottle of pop or similar, in which case the clip on version work best.
Why live for tomorrow, when you can live for today and tomorrow is yet to come?