ATF is not ordinarily consumed. Usually if you are low then you have a leak. It needs to be fixed.
I would only use the fluid required by the manufacturer and it’s not likely you’d get that at ACE hardware. You could go from a relatively minor problem to a major problem by using some kind of “universal” or “close enough” fluid.
Do it right. Walk, take the bus, hitch-hike or whatever, until you get a handle this problem.
CSA