Bowl....sorry i couldnt help but here is an article from the internet.
"Switching your bird is very easy. After all, hamsters drink from a bottle and we all know that birds are much more intelligent than hamsters. It is my theory that birds are able to smell water. Simply showing birds where the bottle is in the cage will be enough to get them to switch. Just tap the little ball on the end of the drinker when your bird is watching. The noise and bubbles will make your bird curious. When your bird beaks the ball, water will come out and your bird will immediately be on a bottle. If not, then remove the water dish in the morning. In the evening offer your bird water in a dish. If your bird does not drink form the dish, then it probably drank from the bottle during the day. If it does drink from the dish then it likely did not drink from the bottle during the day. Repeat demonstrating the bottle to your bird until you are comfortable that your bird is drinking during the day. Nearly all birds will drink during the first day.
The bottle must be changed every day. The bottle and tube need to be scrubbed and disinfected daily.
One of the most often concerns expressed is that 'My bird likes to wet its food'. No problem. Birds can still wet its food with the bottled. Candy, our resident Congo African grey nearly always wets her pellets and treats. She simply gets the food in her beak and then drinks from the bottle.
There is no reason not to put your bird on a bottle."