I've picked up a load of used chick feed trays and drinkers from a commercial poultry farm.
They've changed the equipment they use for rearing chicks to an automated system.
These are made by BEC, to buy them new the trays are around £4, the drinkers around £5
If anyone wants some please just cover the postage or pick them up and you can have as many as you like. (I have hundreds)
The feed trays are 40mm diameter and 2" deep, they'd be ok for ducks and geese too.
The drinkers are 5 litre capacity and are the type I use for rearing my own chicks, they can be used for larger birds, chickens and turkeys will drink out of them no problem, not great for ducks or geese, the lip is too narrow and the water too shallow for them.
I sit them on the floor for chicks, on a piece of 2" slab for adult quail and up on a couple of bricks for chickens.
These have a solid base, they are not the type that you turn and lock into place with the three tabs in the slots that always seem to leak through the bottom, these ones don't leak