I've also looked into mason jars. How does the cleaning compare to freezing the dead culture in a 32 oz deli cup?
Super easy to clean. I pull out the excelsior and throw it away, then put hot water in the jar and slosh it around with the lid on and then rinse it into the sink. Then wash the jar and lid and start a new culture. I have 4 jars so I can have multiples up so my ants never have to go without.
I like that method you use with the metal bowl. I have a glass vial that fit on the feeding lid and I let a few crawl in, freeze the vial for some minutes and dump them into my colonies. Both ways would work fantastic!