As far as I`m aware, the restrictions are more or less universal across the world..... no liquids, gels, pastes etc. are allowed in cabin-baggage, if the container is capable of holding more than 100 mils....even if you had a container which originally contained , say , 200 mils, but now was only half-full, it will not be allowed in hand / cabin baggage...... you can buy suitable travel containers in many stores now, and transfer your various supplies / products into them...... you can put larger ones into your checked-in bags, but as you say, it is sensible to have supplies ` with you` in case a bag went missing/or misdirected.
Why not try using ` Got2B` glued spiking glue before you travel, so you can decide if it would be handy /easy to use while you`re away..especially as you`ll be room-sharing.....it`s really easy to debond in the shower and rinse off...you could have a ` spare` system with you and simply re-bond the ` fresh` dry one when you come out of the shower---that way, you can allow the previous one to dry out discreetly just inside an un-sealed suitcase..... you might just need to use a little tape at the front as the Got2B sometimes lifts a little at the very edge, but it`s very much faster to apply and pop your system on than applying layers of glue and / or tapes...... might be worth considering..... as far as I know too, Got2B is fairly widely-available in Europe [in case you were to run low on it] It`s not great if you get caught out in a heavy downpour of rain..it can loosen/move, but once it begins to dry out, it re-grips....might be an idea to carry/pack a little fold-out umbrella ! Profuse sweating will also affect it but as the temperatures should be relatively normal/low in Autumn, you should have no worries on that account. It will give a good level of hold for 2 or 3 days in ` normal` conditions..... ORWG won`t be any use if it`s exposed to very low temperatures as what may be in the cargo-hold ....best keep it in your cabin bag. There`s no point in bringing big pots of glue anyways----you`ll only be gone 3 weeks, so even if you did 3 de/re-bonds, you`ll have enough in your cabin bag to see you through comfortably.