Eddie,
IF you cannot bury water to the coop (too much trouble, etc.) then I would suggest a 35-gallon Poly tank from either Tractor Supply or Southern States. It doesn't matter - they are the same tank from the same manufacturer. From there, attach a standard PVC ball valve between the tank and a 3/4" PVC union. The other side of the union (away from the tank), bridge to PEX tubing and fittings for everything until you reach one or more 3/4" PVC pipes with your drippers/drinkers attached (I use nipple drinkers, but whatever).
This is the setup I use for a couple of coops/hoops and also my remote pigs. Ten pigs take two tanks a day (one trip per day for the tractor) and the various birds take one tank every few days. I keep extra PVC parts around for breaks or whatnot, and the PEX fittings are so simple that after a 10 minute lesson, my wife was able to fix a few lines when a storm caused a broken branch to put the PEX lines close enough to the hogs that they chewed them for fun (I was out of town for a few days).
If you can bury (or just run above ground) then great. But for moving water, the PE tanks have been great for us for the last few years. We raise things in woodlots and it would be prohibitive for us to trench all the areas we use. Of course, this also means we radically shrink our mini-farm in the winter to avoid hard-freeze issues. I think you would avoid the worst of that in TX.
On Fox and Raccoon: just get used to them. Keep active in the areas the birds forage and maybe score a chance to drop one or two four-legged critters every now and then. But overall it's a matter of managing - not eliminating - the risk. Get more birds than you can name, and don't feel bad when nature calls your birds dinner. The kids get OK with it if you don't hide the truth - mine are 3 and 6 and at this point are pretty blase about finding a carcass, but will also give barefoot chase to a fox trying to get one of our birds. Chickens are cheap, so get a lot of them.
Good luck.
EDIT: So re-reading what I wrote, it sounds like we're unaffected by the raids on our birds. Not so. We hatched out 60 Muscovy duck this Spring and lost all but 24 of them to raiding animals - in two nights. Finding one dead bird is manageable, but coming out one morning and finding 10 missing 14 injured ducks and having to dispatch many of them by hand was not fun. Especially when you realize that the raiders didn't just take what they could eat - they stuck around and killed for fun. If the geese get upset at night, I head out with a .410 and a light. Haven't caught one yet, though. It's been real quiet lately and we've only lost one bird all summer. Winter is the worst.