Rice flour

Rice flour is another gluten-free substitute for tapioca flour. It's manufactured from finely ground rice grains and has a very mild flavor that won't interfere with the taste of your finished product. Because rice flour is stickier and has a higher thickening capability than tapioca flour, you may need to tweak your recipe somewhat.

A decent rule of thumb is to use half the amount of rice flour as tapioca. For example, if your recipe asks for 2 tablespoons of tapioca flour, substitute it with 1 tablespoon of rice flour. If you can't find rice flour at your local grocery, you may get it online.