Just wanted to emphasize to have the doctor's note specifically mention the applesauce, just in case.
My daughter has flown several times with icepacks and meds in a lunch box, letter from the doctor (nobody has ever asked for it) vest, compressor, and neb cups.
I worried about the Rx stuff without individual ables too, but the only thing she had that didn't have it was the pulmozyme and saline... nobody ever cared though.
Do, plan on extra time to get through security though, I'm sure they will want to go through everything. And yes, as everyone has already said.. the plastic baggies are a must.. also if not baby food, breast milk or formula, watch the 3 oz rule on everything else (or is it 4 oz... )
We also printed out and highlighted the TSA rules for medical equipment, but again, she has never had to show it to anyone.
Where in North Dakota are you headed? We just moved from the Seattle area to ND about a year ago.