There are many water sources along the AZT but those I have listed below are the ones that are (in no particular order): reliable, clean, and either on the trail or very close. There were only a few times where I needed more water. I thru-biked in the Fall so certain water sources dry for me may be flowing in the Spring.
There are many more seasonal water sources and cattle tanks located between the sources I have listed. They can be found on the Arizona Trail Associations website and the Guthook App. Both are amazing resources and shouldn’t be overlooked, but there are some pitfalls (see tip to right).
Let me be very clear about something here. As I stated there are more sources available. With that said most are nasty cattle tanks or dry pools of standing water. Even with my filter I avoided these at all costs. You might feel differently about them or there maybe more seasonal options when you decided to do the trail.
My water capacity was five liters. IMO you should have at least six. But how much you carry and where you get your water is ultimately up to you. Next time I would have a larger fanny pack or slightly wide frame bag. Lastly, be sure to test your set up with full water, gear, and food before you go.