What changes the food answer
Give fresh water daily in a clean dish. If the bird dunks food, bathes, or drops debris in it, change it again.
Wash, don't just top up
Film can build on bowls even when water looks clear. Empty, wash, rinse well, and refill.
Placement helps
Keep water away from high perches, messy food zones, and places where droppings fall into the dish.
Watch drinking changes
Sudden increases or decreases in drinking, wet droppings, or not drinking with illness signs should be taken seriously.
Simple routine
Fresh water every morning, extra changes when dirty, and clean bowls every day.