Many old blues guitar players used a Corisidan (antihistamine) bottle as a slide.
For the record(ing):
coricidin
Also for the record: Many '60s Bues revivalists, e.g., Duane (as Noogs has already cited), also used the coricidin bottle for a slide. But it wasn't a great choice for everyone as it was (a) glass and (b) a pretty "snug" fit unless you "pinkied the thing. As an example, I use the (so-called) "ring finger" (left/fretting hand) for slide; I have a circa late 60s / early 70s coricidin bottle (actually swiped from my parents med cabinet
@round the mid 70s, after the meds it contained had been exhausted) that (barely) fits over the top two joints of my left-side pinkie finger, which I do not like to use @ slide, again preferring to use the left-side "ring finger". Thus I "made" several bottleneck (ie, glass) slides from spent wine bottles, older Mateus-brand wine (blanc et rose) bottles serving best this purpose. I still have several of these, which I can use @ the pinky or ring finger, depending on the number and my mood.
Then there's metal, such as the type of slides Johnny Winter and (also) a lot of the first-generation Bluesmen used, rather than glass, to get a more 'gritty' (scraping, etc.) tone/texture. Brass is smooth and (almost) glassy tone might as well just stick w/ glass); copper has a rougher tone, very different than glass (and brass), thus I was obliged to "make" several copper slides. Problem w/ copper slides is that they wear out, so get a goodly length, say, a couple feet, of copper tubing so that you can make replacement slides as you wear 'em out. This isn't necessary w/ glass as it is (after diamonds) one of the hardest elements @ the planet. Re: brass slides I cannot comment as I've never used one long enough to (come even close) to wearing one out.
Edit: Geez, already answered this and stuck my foot in it
...someone edit this out?
No need, your comment is fine as is.