I use the bottle in the warmer weather because the water does stay cleaner and the container is larger so I don't have to fill it as often. I think they do prefer the jar, if I offer both at the same time they will always use the jar. So I remove the jar and leave the bottle, which when the other source is not available they will use. They do get as much water as they want from the bottles. I am in the state of Delaware. I have 15 coturnix quail, 7 hens and 1 rooster in one cage and 7 hens and no rooster in the other. Both groups will be year old this May. I hatched them here at home. This is my 2nd year raising quail and I do enjoy it. What state do you reside in and how many quail do you have?