That's one nice bottle! It looks like a "blob top", (which is a desirable type) because it literally has a "blob" of glass on top.
If you get a chance, you should definitely go back and look for more.
Don't know if my attached picture will work, but I'll give it a try.
These mineral water bottles came is all sort of shades of glass from cobalt blue to screaming yellow, with greens being the most common.
They were blown into a mold and turned in the mold before removing to erase the mold seams and give a more pleasant appearance.
The date range is from the late 1800's to the early 1900's