I use PEX pipe ... that's a flexible plastic pipe that expands a bit if it should freeze, to make cracks less likely.
You CAN use a garden hose or a bucket, as shown in this video, but for various reasons I went with PEX pipe. I ran the water line all the way through the coop, and put shut off valves and hose bibs on the end, so I can flush it frequently in the summer and drain it when it freezes (which it seems to do her for a few days every year).
I had zero experience working with PEX pipe, but managed to figure it out even though I got started off with poor advice from Home Depot. It mostly takes a couple decent tools. There are even "push together" couplings.
I've run PEX before so that wouldn't be a problem, but I can't run a water line to pens that move, so I would have to use a bucket to supply the water. A few years ago I had some self-refilling game bird bowls sent to me from England - you drilled a hole in a bucket and screwed these bowls into the hole. But the things constantly got clogged and then wouldn't refill. Since this is a different setup than those bowls I've tried, it might work with the turkeys.