Hmmm I may be slightly out of my league here as I was thinking something like every 35 miles or so, primarily for fluids, but also something resembling real food.
I'm thinking 3 bottles (good for ~2 hrs for me) & a few hours worth of snacks on board but if this is misguided, tips welcome.
I've got one word for you: CamelBak! Actually, I prefer the Osprey Raptor to anything Camelbak makes, but you get the idea. 3L of fluids, plus plenty of room for food, spare tubes, tools, and a headlight! Yes, I'm originally a MTBer. I've lost more than my share of water bottles on the trail, and have had to hike miles out of the woods with flats, etc.
You'll definitely pass plenty supermarkets and convenience stores and fast food places. Even at the start, which takes you through some of the most remote parts of NJ, there's a couple of bagel shops and diners on the route, if I remember correctly. There's some stretches in the Pine Barrens that are pretty desolate, but if you stop to load up at Hot Diggity Dogs in Chatsworth (it's a hot dog stand in someone's front yard, but actually pretty popular spot!), you'll be good until you make it back to civilization.
If you have a recommended course, a GPX and any specific stops would be helpful (I've seen many variants online)
The "official" course from CJBC on ridewithgps.com. This is the course from 2019, which was the last(only) time I did it:
208.9 mi, +5381 ft. Bike ride in Orange County, NY
ridewithgps.com
I think the course has been the same for years. Jim can confirm.
Lastly, to sanity check I'm not getting dropped in the first 50 miles, what sort of moving speed would you be targeting over that distance?
CJBC used to plan on an average speed of 15 MPH as a guide for when they would open/close their rest stops.