I do not think it is encouraged, although I make sure as an FO to have the FAs hand JSers water even if the CA does not say a word about it. I want to set a precedent. Kidney stones are all too common for pilots.
Funny, I was riding a SouthernJets jumpseat back home the other day and the CA and FO, both commuters, commented how whenever they jumpseat on SkyWest (or most any regional for that matter) if they ask for water they get the full big bottle where as on SJI the best they can get is the tiny single gulp bottles.
If you're traveling back east (with MSP, ORD, DTW, or ATL crews especially), I'd wager a guess it's a very junior FA who simply doesn't know to offer. I've done quite a few trips lately with FA's just off their IOE and it's been a struggle (especially since I'm not used to the DL galley setup so I don't yet know where things are to grab them myself). Just ask. I doubt you'd ever get any grief from the FA's, well, unless it's an AA CRJ-200 route where catering seems to think two 2-liter bottles is all the plane needs for a full day of flying.
Yea that sucks. Gotta love the teach yourself method. I’m currently going through that myself. “Total run time of 12 hours.” I’m almost half through and I’m pushing 15 total hours on it. Don’t worry though day one of class is the Systems test and KV.
It sounds like you've been able to figure it out, but yeah it's mostly a newer flight attendant thing. Apparently in indoc and CQ they scare all flight attendants into not giving out waters; to themselves, flight crews, or jumpseaters, because it's stealing. It's only the newer flight attendants that seem listen, which is understandable because they'll fire those poor men and women for nothing. In fact there's stories of at least one flight attendant being fired for giving out water to the flight crew, granted I've only heard that from other brand new flight attendants so who knows if it's true or not.
But yeah, whenever a jumpseater checks in I'll always say hi and ask if they want a water for the flight.