Honestly, diet caffeine-free soda - mainly because I have diabetes and I'd really like to avoid drinking my sugar because of that, and I realized I had a caffeine addiction and I was able to more easily keep myself conscious/awake if I controlled my caffeine intake better. I know some folks don't like the taste of it, it's honestly one I got used to, and now when I have regular soda it just feels... too sweet? or something like that?

I'm very bad at putting how things taste to me into words, and I'm equally bad at coming up with nuanced opinions about taste in general, either; it's usually either "i like it" or "i don't," my taste buds are a black box lmao

...and I also know there's been talks that diet soda may not be very good for you either, but let me have some joy in my life please ;w;

Specific drink container... I don't really have any in particular I'd mark as my absolute favorite (there's a thermos I like, but don't really use), but if I were to say one, it'd be my Eggbug mug. It especially goes great with this one-step red velvet latte K-Cup I found at the store, because that comes out as a somewhat light maroonish liquid... so I really feel like I'm drinking eggbug

...Oh. Wait, you were talking about type. I like mugs. :P