There has to be a way to get it done. My MIL is on 2 controlled drugs, and has been for 15 years. She sees a Dr. once a year, so I know she is not getting a hand-written 'script every month. She doesn't even go to the pharmacy to pick the meds up, she is home-bound - family members pick up her meds, or they get delivered by pharmacy employees or USPS.
I would talk to your Dr.'s office and to a chain pharmacy. They should both be aware of the regulations. I am sure you are not the only one with the issue of needing controlled drugs on the road, you just need to ask the people that know for the answer.