I would like more info on a glass bottle I found out in the middle of no where.?

I found what looks like a clear glass bottle while hiking a couple of years ago. It is in really great shape other than the dirt. It looks like the plastic bottles my kids medicine comes in but it is glass. It has what looks like a “3” on it followed by III. The only other marking on it is the letter C on the bottom. It looks pretty old and I would be very greatful for any info anyone can provide about it.