will any tranny fluid work to put back in?
Kind of. You gotta be carefull cuz some tranny fluids are designed for transmissions that don't have yellow metals etc and could eat through certain parts. Just gotta make sure the fluid is compatible first and then any brand will work.
Just grab some honda MTF or ATF whichever one you need, then theres no doubt and the new stuff is pretty good I put it in my MT and love it.