Filling bottles sure does get old. I have about 16 water bottles and 3 dishes for various bins of rats, and it has to be done. I made it into a game of sorts, unscrewing bottle tops while a bottle fills under the faucet, and if the bottle gets full before I'm done with the other bottle's lid, I get sprayed with water. Incentive to rush to get the tops back on the bottles!
Yes, I'm aware, I have no life.
The tub system in those pictures works pretty well. I normally use a long strand of thin wire to "sew" the mesh onto the lid now, only because it looks neater and I don't have the zip tie cut ends poking me. The rats have not chewed the bin with zip ties on it yet though.
I also saw someone that puts a metal washer over the "spigot" hole, so the rats can't chew the hole larger. I'm certain it was someone on here, so maybe they'll chime in with a picture.
Right now, the few tanks/bins I have rats in(not racks)I give water in dishes to them. It works fine, but you have to rinse the dishes and refill them at least once a day, and at first the rats will tend to fill it with bedding.