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You can use a pressure reducing valve and attach it direct to a hose. Or you can use a gravity bucket. I use a bucket that I made and installed a toilet float valve in so that I can add ACV or whatever. Your bucket needs to be about 4ft higher than the drink cups. They sell both the valve and the bucket. The cups don't store water like a float valve, when the chick puts its beak in the cup and pecks the yellow tab, it releases water in the cup. The cups are SUPER easy to clean. It does not freeze here, but I could see that this will not work where it will freeze. But if you have them in a cage, I would hope the room is warm enough to not freeze.
I like the cups because I almost never have to clean or fill anything, about every 3 weeks, I clean the bucket and then remove the cups and clean them with bleach. But it is an easy process.