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I'd think that "saor ó dhrugaí" would be the most literal way to handle it (though it sounds kind of Béarlachasach to me). I suppose one could also say "Gan drugaí" or "Drugaí ar bith" if you wanted to rephrased it as "no drugs."
In De Bhaldraithe's dictionary, he agrees with both of your first two suggestions, giving these examples under "free", but it looks as though
saor would work best in your context:
saor ó rudfree from something
saor ó dhleachtfree from duty
bheith gan cúramto be free from care