I did the CT last year in July and August. The data book for water sources was almost 100% accurate. With the high snow year, most streams and seasonal trickles were quite good. The longest dry sections were the burn out in section 2 from the South Platte river to the firehouse and the last part of segment 16 until Baldy Lake in Segment 17. This year may be different.
Get an early start each day, because the afternoon thunderstorms and rain starts as early as 2:00 pm. Monitor your pace and plan to avoid high areas above treeline late in the day.
You probably don't need to carry anything except the data book for route finding and informaiton for getting to and from town. I downloaded Paul Mags resupply list and copied the summary pages from the guide book. That was sufficient.
I stayed in Breck (Fireside Inn), picked up a resupply box I mailed to the PO in Twin Lakes - the only place you really need to do this since all other towns along the way have proper groceries, etc, Salida (Simple Hostel), The Wunderlust Hostel in Gunnison (make sure you meet up with the trail angel Apple, just before the end of Segment 17) and the Silverton Hostel in Silverton. Finish in Durango, i just found a motel since the hostel was so far out of town.
A few things about Durango. You get a free CT brown ale at the local pub, Coasters, for completing the thru-hike. A ride on the train to Silverton and back is really cool. The piano bar at the Strater Hotel is awesome, and their black beer rocks! And there is no public transportation between Durango and the airport , which is 15 miles out of town. Luckily, the same good samaritan who gave me a ride from the trail to town offered to give me a ride to the airport as well.