I don't have any pictures, but I have made them. I would suggest a 5-gallon bucket b/c the plastic is a bit more sturdy than a milk jug. I have a chain hanging form the rafters of the coop and hook it to the handle of the bucket with an "S" hook. I put it at a height that the adults have to stretch their necks a bit to get a drink.
When you get the nipples, they should say what size the holes should. You can use a drill gauge if they don't. Then a drilled 4 (3 in your case) evenly spaced holes in the the bottom of the bucket and screwed the nipples in. I try and put them toward the edge of the bucket so several chickens can drink at the same time. 3 nipples is probably plenty as that's all the more chickens that can fit under it at once.
I haven't had many troubles with it. I thought it might leak a little. Once nipple drips a little if I let the water get low and the pressure on the nipple to get low. One problem I did have was with the nipples freezing up, but I don't suppose you'll have that problem in TX. Mine doesn't actually start freezing until the temps drop into the high-teens or low-twenties for a while. It was 18 last night and things looked okay this morning. The other issue I had was with the lid. When you hang the bucket full of water it distort the shape a little and the lid doesn't fit quite right. It was kind of a pain to take off to fill, so I cut a piece of heavy, yet-pliable plastic to cover the top. I just fold it back to fill.
Although they stay clean for a relatively long time. I do have to take it down and scrub it every couple of weeks, especially in the summer. I really haven't had an algae problems, just general muck that needed cleaned out. Even with it covered, some gunk get in there when I uncover it to fill it. It still bits a dish or fountain IMO.