When we first started, we got the plastic one at a feed store that held the dry feed. It worked fine. We also got a metal water font and that worked fine, and we put it up on a paver stone to raise it above the ground to reduce the mess.
Then I started fermenting their feed and discovered they digested it better, got beneficial probiotics from the process, and since the feed expanded exponentially, I saved money on the amount of food used. I found at our favourite local thrift store a thick, heavy round baking dish, used probably for tarts or quiches, and since it's heavy enough, they can't knock it over by standing on the sides. To this day, it works great. Fresh food in the morning, and by the end of the day, they've finished it, and I supplement with sprouted lentils or gardening scraps/weeds/clover or fly grubs. I got a second dish, this one also an oven-wear dish that is rectangular. The second dish helps with our little resident bully, our tiny silkie, Dottie. Yes, she has Napoleon Complex. LOL.
Note: This is in their run, never in the coop/nesting boxes. Just like everyone has said.
As for the water font thing - I had been eyeing the water systems that had either the nipples or cups that self-fill and was hoping to find a sale or something. Began researching, reading reviews, looking through the articles here. Wanted to do an outside unit, with pipes going in and the little cups. But it was a lot of work and focus for a very tired, scatterbrained family. Once I saw the metal font was beginning to discolour due to rusting, I knew it was time, and I bought the smaller, but not the smallest, Rent-a-Coop waterer. It's a corner unit, has four cups that refill automatically, and is actually really well made. Bit the bullet on it probably two months ago and am so glad I did. I add a wee bit of Apple Cider Vinegar (which you cannot do with metal fonts) to the water and the girls took to it right away. They are still messy as can be, and their dust baths kick up the litter and dirt, so I actually have a dedicated turkey baster that I use to suck out the messy stuff every morning. You know that meme that some made about how "Provided clean drinking water; Prefers water from muddy puddle" or something similar? Yeah, that's totally true.
You'll find what works best for you, and then you'll notice things about it that could be better. You'll upgrade. I wish you the best!