Doing long rides is just not a problem..Each month, I don't necessarily make a 100 miler, but usually at least two 70 milers.
Just don't view it as a problem..More often than not a casual ride just out touring for a day..I know water fountains and 7-11 are common, if not stop for lunch with the group..
If I were going to ride hard out in the middle of no where..I would take my camelback..Couple energy bars, gel packs, Hopefully a lunch spot would be open somewhere before 100 miles were up..Pick up a banana, orange somewhere..What is the problem..Unless you are crossing the Rockies with a 27 mile , 9,000 foot climb. Then you better take a handful of power bars and gel packs. Plus a performance drink.