In other words, that's how it is.
There might be some people out there who can actually do it, but it's impossible for the most part, right?
Additionally, despite the dilution, the ingredients used (most likely) have an Abyssal origin, so they're still unsuitable for the shipgirl palate, in any case... or so it seems.
Do you really think that there's anyone...
who'll be fine after drinking undiluted Cal*is...?