Almost all glasses are made of PET, or at least something other than acrylic. Getting a good glue joint with other plastics can be a problem. I have been surprised at how few common transparent plastic items are made of acrylic, which makes this kind of DIY much more difficult than I expected it to be. PVC is, of course, another easy to join plastic, but clear PVC isn't very clear, and very few things are made of it. All bottles for juice and carbonated beverages, and bottled water are made of PET. As far as I can tell, gluing PET just isn't commonly done, and the advantage of PET is that it can be blown out to extreme thinness, but that is a disadvantage when you try to use those products in DIY applications. About the only PET items I could find, that are usable, are "preforms", which look like test tubes, but are intended to be blown out to full bottle size.
The best news for DIYers is that I find Lexan to be very easy to work with, nearly impossible to accidentally break, and glues even better than regular acrylic. But, all Lexan I see is sheets, no other forms.