I like to use a wide mouth 16 oz. bottle, because I know that will last at least 24 hours for a breeding pair and the wide mouth and height of that size make it easier to scrub out to clean with a baby bottle brush. I also found cleaning brushes the size of a pipe cleaner to clean the nozzles at amazon.com. I sanitize them in the dishwasher after scrubbing, but putting them in the dishwasher alone does not remove the film that can accumulate in them.