I don't have experience with bitters, as Uncle Jed may have had, but I do have a 4000+ count bottle collection (or a collection of bottles, depending on who you ask). I don't search or collect any more, as that was a hobby starting during high school days. My collection is mostly boxed and stashed away, now. Lots of interesting aspects of knowing and collecting bottles. Those times were fun.
Not too long ago, I gave some bottles to an elderly friend, whose 6' bottle tree was blown over by a storm.... the post had rotted at the bottom. I brought her a 15' long old sinker cypress, 5" top-8" bottom diameter log and fixed her up with lots of spikes for holding lots more bottles. Her lawn decor is really nice and she's delighted with her new bottle tree. ....Which reminds me, I'm due to go visit her.
And speaking of more bottles, today, I'm cleaning canning jars and doing other preps, for picking and canning figs and fig jam, tomorrow.
Sonny