Add soy milk and yogurt starter to Instant Pot and stir until starter is dissolved. Set Instant Pot to Yogurt setting for 15 hours. Turn pressure release value to off.
When the yogurt is cooked, pour the yogurt into your nut milk bag, and let it drain over a bowl for 4-6 hours. If you like your yogurt super thick, leave it for 6 hours; if you like it thinner, leave it a shorter period of time.
After the excess water is drained from yogurt, add fruit or nuts according to your personal preference.
I used Yogourmet Yogurt Starter which is measured in grams. What ever brand you use, make sure that you add the amount of starter that is appropriate for 64 ounces of soy milk, according to the starter package directions.If you want to continually make yogurt, reserve 1/2 cup of your batch of yogurt, and use that as starter for your next batch and add it to the soy milk instead of the powdered starter.