Finding the right feeder

The key thing to keep in mind when buying a feeder is to keep the food clean, dry and hygienic.
Water needs to be dirt free some can be suspended from the ground but normally a troph is the simplest option.
You can find poultry feeders from place like Pets at Home. Some are more expensive because they are galvanised or have a hook to hang up off the ground. But buy the one you believe is easiest for the birds to feed from which may depend on their height.

Tip: if you have a ground feeder lift it on to a couple of bricks so dirt is less likely to contaminate the water or food.