There are several synonyms for the phrase "bitter draught," each with their own nuances. "Acrid potion" evokes a sense of sharpness and pungency, while "astringent elixir" suggests a harshness that tightens one's mouth and throat. "Sour concoction" brings to mind a tangy, acidic taste, while "unpleasant infusion" emphasizes the overall disagreeable nature of the drink. "Nauseating libation" adds a physical dimension, hinting at a queasy stomach, while "repulsive tonic" connotes a deep aversion and rejection. Ultimately, all of these synonyms convey the same basic idea of something unpleasant to drink, but each has its own set of connotations that can add further meaning and nuance to the description.