I agree, definately bowls. And i agree with the bottle that I would get lazy and just go 'Ah it can wait till tomorow'.. but tomorow never comes.
While your cleaning everything in the cage each morning (fruit dish/nectar/seed/paper)the bowl are not a pain to clean while you are at it.
Also I think it is a much more natural way to present it to the birds , and in the bottle they will may not see it as a source of water.
Sorry I am not trying to intrude the post but wo things I have been wondering though are:
*Rainwater that possibly has germs and parisites (and wrigglies!!!) (what me and my family drink at home, we live on tank water) or..
*Bottled town water with chemicals and all that rubish?
also for water a stainless bowl or a plasic bowl?