You may use one large bok choy (these are the size of a full head of celery) or 6 small baby bok choy.
To improve the digestibility of the jasmine rice, consider adding 50% more water and cooking an additional 10-12 minutes (until water is absorbed).
When you cook rice and then refrigerate it overnight, you will create resistant starch. If you eat this cold, you will be eating resistant starch which will likely set off your symptoms. Always reheat rice (and potato) before eating. This breaks the bonds of the resistant starch.