Well, opening it up to what you find alongside the road actually makes the odds of finding a watertight container pretty good, since a lot of trash collects along the road, including bottles of piss, empty fast food glasses, plastic buckets, and other such savory containers. An empty plastic large drink glass from McDonalds sealed with a scrap of plastic held in place with a rubber band, length of string, or something else to keep it tightly in place would probably be sufficient. Now a water tight container without access to trash would be more difficult. (Which could happen after a group of people doing their community service have gone through.) Or, finding something I would want to drink out of as is would also be difficult.
Starting completely from scratch would be difficult, even for the vinegar. First the fruit would need to be located. This far north at this time of the year is most definitely not fruit season, with all of the trees and bushes bare. So, it would have to be the right season. Squeezing out the juice would require a work surface, which in nature might be a large, flat rock, a way to capture the juice as it runs off. Then there would need to be a container, sealed to keep it from evaporating/being drunk by something or someone. (Of course, fruit DOES ferment on the vine, so the aging part might not be so hard. Just watch for birds which can't fly straight after feasting on some berries, and pick those for the juice.) Etc.
Vinegar might be the easiest step, but, without tools and technology, that doesn't make it easy.
Also, getting a battery of the proper voltage would also be tricky. In this age of electronic devices of all descriptions, we also have batteries of nearly as many descriptions and voltages. Hearing aid batteries have their own display at the local drug store. And there are stores which sell nothing BUT batteries.
Due to lack of funds, I did get to experience living without electricity earlier this year. Light bulbs are a definite improvement over candles and even flash lights. (I also learned that Food Stamps cover ice, but ice doesn't keep all that frozen stuff purchased with Food Stamps the day before the power went off as frozen as well as I would like.) Living without the electric company is possible, but most definitely not as nice as with it.
Ooops! Past my bed time. Good night!
"Nothing is withheld from us which we have conceived to do.
Do things that have never been done."