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100% low on coolant, which means you have a leak.
If it suddenly got really shitty, then it’s a big leak and no way around it.
If it’s slowly gotten shittier and shittier, so slow you’re just now really worrying about it. Then it’s likely a tiny pinhole leak. The environmently right thing to do is still to get the leak repaired, depending on your state laws you may not have a choice.
But for a pinhole you can charge it back up and could be good for years, could be good a week.
Now you’re a renter, so if you’re in a good state you maybe able to report the suspected leak, and then they have to get it checked?
It’s one of those things where any one person has a negligible effect, but if everyone goes one way or the other it’s a huge effect, so some states say you can’t charge without doing a leak check and then they have to fix it before charging.
That’s gotta depend on location…
I’ve lived in a couple US states, and AutoZone always carried it.
Just checked online and even amazon sells 134a