Here is the waterer on the coop.
I had to build a removeable triangle of wood so I can keep the "J" upright when I am replacing a full waterer. The green triangle of wood is held in place by a very high tech device known as two screws and a piece of wire.
Remove the pipe and lay it so and use a garden hose to fill. When you stand the "J" back up it will glug, glug, glug for a bit and no water will spill out. The cap and elbows must be airtight to allow the vacuum to form. I recommend glueing them together.
Replace the pipe and the triangle wood. The pipe is held in place by two screws and wire. I just wrap the wire around one screw to hold it. I got tired of spending $30 on wood and $40 on hardware. It's not pretty but the chicken waterer fashion police have yet to issue me a ticket.
On the inside of a real coop You could set the bottom of the waterer on the floor and bungee it to the wall. I would guess that this 4' long 3" diameter pipe would hold about 1 1/2 gallons. Larger or longer pipe would hold more. I got the idea from this forum.
I hope this helps a bit.

I had to build a removeable triangle of wood so I can keep the "J" upright when I am replacing a full waterer. The green triangle of wood is held in place by a very high tech device known as two screws and a piece of wire.

Remove the pipe and lay it so and use a garden hose to fill. When you stand the "J" back up it will glug, glug, glug for a bit and no water will spill out. The cap and elbows must be airtight to allow the vacuum to form. I recommend glueing them together.

Replace the pipe and the triangle wood. The pipe is held in place by two screws and wire. I just wrap the wire around one screw to hold it. I got tired of spending $30 on wood and $40 on hardware. It's not pretty but the chicken waterer fashion police have yet to issue me a ticket.

On the inside of a real coop You could set the bottom of the waterer on the floor and bungee it to the wall. I would guess that this 4' long 3" diameter pipe would hold about 1 1/2 gallons. Larger or longer pipe would hold more. I got the idea from this forum.
I hope this helps a bit.