» Arrowroot substitution is possible with cornstarch. You can get the same benefits and qualities with the use of cornstarch. » Regular flour also forms a suitable substitute for arrowroot only when used as a thickener. 2 tablespoons of all-purpose flour is equivalent to 1 tablespoon of arrowroot powder.» Similarly, 1 tablespoon of cornstarch can be substituted with 1 tablespoon of arrowroot powder.Other substitutes include: tapioca granules or instant cooling tapioca, kudzu powder, and potato starch/flour. » While using the substitutes, you must also know when to use and what quantity to mix to get the desired taste. Regular flour also forms a suitable substitute for arrowroot only when used as a thickener. 2 tablespoons of all-purpose flour is equivalent to 1 tablespoon of arrowroot powder.