I ise Bosh&Lomb solution. They had a 2oz bottle, which I used, but the last time I went shopping for it, couldn't find it. Found a 4 oz. I've been through three (?) airports, including ATL, and haven't been questioned about it. Also don't declare it.
Don't know if the fact I,'m TSA Pre makes a difference.
OP, I would suggest having a small bottle in your carry on. You can be delayed or have a "contact emergency" where you'll want/need some.
That being said, I can't imagine taking a trip long enough that I would need a full size bottle. That's just me though.