KfP "beer"
In the "this is just wrong" category: kosher-for-Passover beer (forwarded to me by
ralphmelton). Someone else on my friends list (
arib, maybe?) spotted something like this (probably this) in a store but couldn't bring himself to investigate, if I recall correctly. I thought at the time that it was a labelling error or a local thing, but I guess not.
I'm not a big beer drinker and don't feel overly constrained by that aspect of Pesach, but I would buy a single bottle out of curiosity were that an option. Not an entire case, though.
I'm not a big beer drinker and don't feel overly constrained by that aspect of Pesach, but I would buy a single bottle out of curiosity were that an option. Not an entire case, though.

no subject
http://www.celestialseasonings.com/research/general/kosher_6.php claims that a number of Celestial Seasonings teas are certified kosher, but not kosher for Passover. No explanation of why not--perhaps they just didn't pay extra for that certification. (Even their green teas are not certified kosher for Passover, for whatever that might be worth.)
http://www.bigelowtea.com/help/faqdetail.cfm?faq=19 claims that sixteen of Bigelow's Classic Teas are kosher, which is interesting because their website lists 19 varieties of Classic Teas. I didn't do the extra step of identifying which three weren't listed, but I didn't notice a "Bacon and Cheese" flavor of tea in the list.
http://www.globetrends.com/KosherTeas.htm claims a bunch of their teas to be kosher for Passover, including some fully fermented varieties. Given this, I think that my speculation about fermentation was inaccurate. Unless the answer is "paid for stronger certification", your guess is as good as mine.
no subject
I found this page (http://www.star-k.org/kashrus/kk-thirst-coffee.htm) on the issues of kosher coffee. (One process for decaffeinating coffee yields non-KfP coffee.)
(I have to say that http://www.star-k.com/cons-kash-articles.htm is pretty fascinating to me as an outsider. I get to read about the issues of Shabbos north of the arctic circle, or when traveling across the International Date Line, and find out how to kasher a 4-story water tank.)
Aha! http://www.star-k.com/kashrus/kk-passover-problem.htm is titled "But what could be the problem with...", and covers coffee and tea. The possible problems are with decaffeinated or flavored teas, or with instant tea. (Apparently not all matzoh is KfP either, though it doesn't detail the failures.
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That's easy. If the process from when water touches the flour to finished baking takes longer than 18 minutes (or is it 18.5?), then it's not kosher for passover.
Also, you'd need the oven, preparation area, tools, etc. to be KfP as well.
As far as teas, I think the short answer is: Jews are crazy all the time, and passover makes them more so. A friend of mine who is a therapist thinks that Jews invented OCD (obsessive-compulsive disorder).
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The Moadim U'Zmanim's opinion on Shabbat within the arctic circle -- that Shabbat lasts its usual amount of time but you just plain skip daytime-only (or night-time-only) mitzvot is novel. I also liked the off-handed "Shabbat in space -- consult your rav" advice. Should it become relevant, I'll be sure to do that. :-)
With non-kfP matzah, as
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Of the flavourings I hazard no guess. I keep strict observance in that respect: any flavouring in tea is not permitted! ;)
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I tend to take my tea unadulterated for the most part too, though I'm guessing there are probably flavorings involved in the fruit-based flavors (like orange). And I never seek out intentionally-decaffeinated beverages, though I'll sometimes drink ones that come that way on their own (e.g. some mint teas).