Snail only tank

My wife just started a science teaching job and I would like to set up a
tank for her class. I have a 5 gallon Pyrex glass jar/bottle that I would
like to use. What I hope to do is set up a water terarium - hopefully a
couple of plants and some snails. They tank will not be able to be heated
(room temp only) and could get somewhat colder during winter break also no
filtration. Is something like this even possible? Any suggestions for
species of plants or snails? Substrate?

Thanks-
Jackson