Picture of A simple watering system for a chicken brooder
Say you decide that you want to buy some day-old chicks from a hatchery or a place like Tractor Supply.  The very first thing you are going to have to figure out is how you are going to keep them in warm environment where you can keep them until they develop enough feathers to weather the environment of a chicken coop.  My solution has been to put them in a large plastic tub with straw or pine shavings on the bottom to absorb their mess.  If you do this, you are going to have to provide them with food and water. 

Tractor Supply sells watering and feeding dishes that are designed to be placed in the bottom of the brooder so that the chicks can get to them.  In the second and third photo you can see the base of a watering base and the base with a jar screwed into it.  The threading of this base matches the threading on a small-mouth Mason jar.  I can tell you that this is not the way you want to go.  If you have pine shaving in the bottom of the brooder, the trough around the base will be filled with shavings within five minutes.  Within a week the chicks will be able to jump up and perch on the top of the jar and aim their precious dropping down into the trough.  You will be cleaning this out every couple of hours. 

This instructable will show you a much better solution.