I'm figurin' your age,it's quality,your use,etc..or the equivalent of my use also.

.I wouldn't use it enough to warrant owning one..Why I suggested just revamping a blade for the cut or two for your miter box.
If it was me,I'd use a worm drive with an abrasive blade..I told you I have a couple in small circular saw tables..

7-1/4" circular saw size abrasive blades can be as cheap as $2..and everybody has a 7-1/4" saw...
I'd setup a fence and a 90 degree stop that you could just roll the bottle against over the blade barely sticking up..If you don't have a saw table,screw the saw upside down to a piece of plywood with the blade plunging through 1/4-1/2"...and screw a fence to it,like a regular saw table.As long as you push the back end of the bottle against an inside corner and cut the other end off(free hanging)..it shouldn't go anywhere and cut clean.You can always use the side of the blade as a grinder for cleaning the cut.
In all my life in construction,I've never had to own one of those..but have cut everything up to 4" cast iron or steel pipe,stainless handrails,etc..To me it' s an unnecessary tool.
The views and opinions expressed by this person are his own and not the general consensus of others on this website.Realityguy