How to add a product availability ticker.

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I'm having trouble finding an answer to this that doesn't involve a lot of technical lingo that I'm unfamiliar with. 

I would like to add some sort of counter on each listing that shows how many of that particular item is available. I'm finding that if only one item is available and they try to select, say, 5.. then it won't show a quantity reduced/unavailable until the checkout screen. 

I'd like for there to be something in the listing that says "1 available", "5 available", etc. 

Is this an option? If so, how do I do it? Please explain it to me like I'm stupid, because I am far from tech savvy! Thank you!