Material
Stainless is a strong default.
Updated
Bird guides
The best bird bowls are easy to wash, sturdy, correctly sized, and placed away from droppings. Stainless steel bowls are a strong default because they clean well and resist chewing better than many plastic dishes.
Bowls are daily health tools, not just containers.

Supplies
The best bird bowls are easy to wash, sturdy, correctly sized, and placed away from droppings. Stainless steel bowls are a strong default because they clean well and resist chewing better than many plastic dishes.
Keep dishes clean enough for daily use.
Use the hub for nearby questions after this answer.
Use supplies after the care plan is clear, not before.
Pick gear that makes the daily routine easier to repeat.
Stainless is a strong default.
Food and water stay apart.
Wash daily.
Avoid droppings.
Match the bird.
Make swaps easy.
Use separate clean bowls for water, staple food, and fresh food. Wash them every day.
Stainless steel is a practical default. Heavy ceramic can work if lead-free and undamaged. Scratched plastic is harder to keep clean.
Keep bowls away from high perches and favorite poop spots. Do not make the bird climb through droppings to eat.
Tiny birds need accessible shallow dishes; large parrots need sturdy bowls that cannot be tossed or destroyed easily.
Clean, separate, stable bowls in places the bird can use without contaminating them.
Some may work short-term, but scratches and chewing make them harder to keep clean.
At least separate food and water bowls, plus a fresh-food dish when needed.
Away from droppings and placed so the bird can eat comfortably.
Bowls are easier to inspect for many birds. Any system still needs daily cleaning.
Use these after the care plan is clear. Match size and materials to the bird you actually keep.
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Separate clean food and water dishes that are easy to wash every day.

Keeps daily cage wipe-downs simple without fragrance or harsh residue.

Keeps pellets and seed portions sealed, labeled, dry, and separate from treats.

Plain paper makes droppings easier to monitor without scented products.