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Prepare fresh food appropriately. Store food in closed containers. Provide a clean food dish. Remove fresh food after an hour. Provide a clean water bowl. Eat with your cockatiel.
Any fresh food given to your cockatiel should be cut into small pieces, no larger than half an inch. They should also be washed well. Pesticides on fruits and vegetables can be toxic to your pet. Seeds, pellets, and treats are all susceptible to being infested by fungus that could be deadly to your cockatiel. To be sure that this does not happen, store food in tightly closed containers and in a location that is cool and dry. You should feed the cockatiel with a clean bowl. Wash the bowl daily with hot, soapy water. Consider having two sets of bowls that you can switch out when the other is being cleaned.  Cockatiels are naturally foragers, who enjoy the opportunity to search the ground for food. Consider occasionally scattering food across the floor of the cage so that they can forage. In providing cockatiels with this opportunity, however, you should be cautious about food hygiene.  Placing food directly on the floor of the cage is more appropriate for foods like pellets and commercial treats, which will not rot. Be sure that fresh foods are easy to find and extract from the cage so that no rotting food is left in the cage. Fresh foods left in the cage for more than an hour will begin to rot and could pose a health threat to your cockatiel. Feed your bird fresh food in a bowl and remove the bowl by the end of the day. Search the area for any remaining scraps on the bottom of the cage. Remove these as well. As with the food bowl, the water bowl should be washed daily in hot soapy water. If you notice food particles, feces, or any other solid particles in the water, you should take it out and clean it immediately. If you do not trust the local water enough to drink it yourself, you shouldn’t give it to your cockatiel either. Provide your cockatiel with bottled water, if necessary. Cockatiels are social animals that, in the wild, eat with their flock. Try to feed your cockatiel around your own meal times to build a closer social bond. To encourage bonding, you can also try to hand feed it. Place a few seeds in your hand and hold them out for your cockatiel to eat.