The correct word is "to". The phrase "accustomed to" is a standard English idiom used to indicate that someone is familiar with or has gotten used to a particular action or situation. The sentence should be: "He is accustomed to drinking so much."
He is accustomed _________ drinking so much.
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Question context
This question is part of 🗣️ Verbal Ability within the broader 🧠 Aptitude Mastery subject and appears in the ASF Airports Security Force preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.