This tubing works with RentACoop's Sip Station tubing adapters with barbed connectors (https://www.amazon.com/dp/B0D4F7DB5K) and is especially good for small watering setups or for running waterers along a fenceline for free-ranging birds. You don't have to buy PVC pipe or drill holes in it (as with the RentACoop S.N.A.P. system, reviewed separately), and there's plenty of tubing to be forgiving if you make a mistake. RentACoop's videos are very clear on how to install everything and what you need to complete your setup.
For a few backyard chickens kept penned in a small coop/run, you can set up a gravity-fed watering bucket or other container outside of the run, leaving more real estate for your chickens to run around in inside. If you don't have a lot of thirsty chickens, you can easily top off the bucket with a hose as the water drops without running yourself ragged.
I've tried all sorts of watering setups for chickens. One thing I'll tell you: Do NOT waste your time putting in watering that the chickens can roost on top of or scratch dirt up into. I've tried those square watering containers with cup waterers inside the run, and it's a constant battle keeping the water clean. With the base and the jutting-out watering cups, this waterer takes up almost enough square footage to keep another chicken!