"I suppose I am primarily concerned with water issues. I have made some longer trips but am curious about the PCT and thru hiking it."
If you have little experience at either the PCT or CDT, I suggest that you tackle the PCT first.
For either trail, if you get to the point of being pretty serious about it, definitely invest in Yogi's Guide
. Ideal is to buy the latest version for the year you're hiking, however.postholer.com
has quite a lot of PCT-specific info, including a FAQ that will cover a lot of what you want to know.
discussion group is typically pretty active, a good place to post questions and get answers, though in the past at least, I found at times a lot of volume of email relative to the useful information. You can also search through their archives, however.
Less volume perhaps, but often resulting in good answers/good discussion is the PCT subforum on whiteblaze.net, http://www.whiteblaze.net/forum/forumdisplay.php?416-Pacific-Crest-Trail
For water issues in particular, hopefully AsABat still puts out his water report for the southernmost 700 miles. For that stretch, his water report is the most important "guide/map" stuff you'll carry. If you go there during typical NOBO thru-hiker season, there's significant support, but a person can also do it all on their own, i.e., not using water caches except for emergencies. On my trip I ended up using cached water just once, and that just as an alternative to some of the nastiest slime-green water I've ever seen; I could have skipped the water cache there too, but ... :-)
If you have more specific questions, post here or one of the above places; you'll get more answers from folks that have hiked the trail on pct-l or the whiteblaze PCT subforum. I think the latter is easier to use, FWIW.