I think he knew they were coming and was getting ready to go on the lamb. Sandwiches/snacks so that he doesn't have to stop in public to get food. The fewer people that see him the better. Take her stuff and ditch it along the way.
If he were stashing her somewhere to protect her from some stalker or so that she could start a new life, he'd have certainly left her clothes with her; don't you think? He wouldn't be like "hey, hide out here. I'll be back with your clothes and fishnets in a couple of weeks" Keep in mind, 3/15 is when family reported her missing. They didn't arrest him until 2 weeks later.
Is she being held captive? Maybe, but I doubt it. LE would have probably checked any kind of cabin/property that the family has. Would assume anything would be in the fathers name with him only being 21. Also agree that if he is holding her captive, without food and water...
If she were going to start anew or go into hiding, wouldn't she have just stayed in Florida?
I still can't help but think that 3/1 Marshall Township thing is somehow pertinent to all of this.
One last thing and I apologize as it's a little morbid. If she is deceased and we use 3/15 as the date as that's when she was reported missing,( although I believe her demise would have occured somewhere between 3/5&3/9 because they tracked his cell in Florida 3/9-3/15) , but let's assume 3/15. That's 3 weeks. I'm just assuming at this point that if there is a body found, they'd have to wait for DNA because of decomp?
Rambling again, Sorry guys!!