Originally Posted by
TheRef
... I won't be carrying anything and I'm wondering what's between the two places in terms os services, food, water etc...
You aren't going to be in the boonies by any stretch of the imagination - you will be in the highly populated northern VA region. There are lots of stores, services, food places, etc, right off the trail. Most of the many camping spots along the trail have potable water in trailside pump faucets.
Where the trail goes past Leesburg take White's ferry across the Potomac and visit Leesburg for great food, its lovely historic areas. Bicycle Outfitters is there in case you have a cycle emergency or just to enjoy some time looking at their Trek bikes or talking to the friendly shop personnel. There is an eatery at Point of Rocks right off the trail as well. Be aware the temps will be near 100, so be prepared.
Enjoy the ride. The canal is beautiful, tree shaded, and quiet.