In short: I like to have Cait as a companion, and I've now gotten her quest where she wants to go to Vault 95 to clean herself up. Problem is, I've read that after she does so, she disapproves of you using ANY chem at all. Which means after I do this quest, I may have to avoid traveling with her because I usually rely on rad-x, radway, and stimpaks to keep my character alive. Is this an unfounded worry? Is she going to care if my character relies on those three chems?

She disapproves only when it's Buffout, Psycho, or Jet.

Are you saying that she considers Rad-X, Radaway and Stimpaks as 'bad' chems?

I'd just get her cleaned up and drop her off at whatever house you want her to live at. I imagine you've heard about all her dialog by now any.

She considers Rad-X, Radaway, and Stimapcks medicinal I assume since she doesn't disapprove of their use.

Stimpaks and the rads are fine. Its the stuff like jet, mentats, and psycho that she dislikes.