Get the best syrup you can locally and use it till your shipment arrives. Non-organic isn't the end of the world. Most maple trees don't get sprayed with pesticides, etc.
The idea of the cleanse is not to obsess over the details but to rest your body processes and let nature take its course. Tune into your body -- while the body is processing only a limited intake, you can tune in and listen to its messages. When you eat lots of different types of food, the body's messages are confused by its varied reactions.