Sharon is right. Barley lasts the longest, but most of us don't like the scent as well. I would make it so you can slip in a cheap bag that you can refill, then you don't have to slit the bag open when it's time to refill.
Good luck. This site will give you some ideas
http://www.healthandbodystore.com/n ... tml?gclid=CN2_vJ27sK4CFQ40hwodeErGPw
No. You cannot use instant rice in a rice bag. The rice will cook when heated in the microwave and if heated for too long the rice will overcook and could catch fire.
Use long grain white or wild rice, or a blend of both. Personally I use the jasmine rice because it has a nice soothing scent when it's heated.
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