Lets assume I am abseiling multiple pitches with some tuber device and at some point at a belay I dropped the device. How do I improvise something that does the braking while descending? I still have standard climbing equipment like biners/slings just no braking device. The less equipment needed the better.

One obvious way is to use a Munter hitch, but as this question shows this results in serious twisting of the rope. So I am mostly interested in alternatives and if still is to be the Munter hitch, is there a convenient way to get both strands (loaded towards the top and unloaded towards the bottom) to be parallel?