Let me know if you come to London as I know a couple of places here where you can get Calpis/Calpico in concentrate.
Your soda Calpis should be fine out of the fridge until you open it. I don:t know about the 'premium' stuff though. I've not tried it, I was put off when told it was much thicker than the regular kind.

I'm afraid the way you phrased your original post was, to some of us... a little peculiar, but not 'wrong' or in any way offensive. jib71 was able to put his finger on what seemed strange about it. His comment was more to do with his own proficiency in English than any deficiency on your part. It's a slippery language.