Brutes are perfectly fine. I would fill, wait 24hrs and dump them a few times with FW to get any plasticizer out. A few years ago I remember ppl were having issues using water from a new Brute can. After setting a few water RODI/NSW mixing and transfer stations and treating as such, never had a problem.
I would have put up jack studs as well to minimize "bounce". When you decide to finish the basement, you wont have to deal with sag and jacking up for a wall and level ceiling. Also if you forget to level the joists for a wall, you wont notice the slight sag...that would drive me bat $h!t crazy