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I'm planning on traveling to europe from USA and will be taking trimix. How can I store it properly while on the plane and in the hotel?

There is a product called frio wallet that will keep your tri mix cold during the trip.

When I’ve had to travel long distance I have put my vial in a ziplock baggie, slipped that into a thermos, filled the thermos the rest of the way with ice.
If I were flying I would tape a copy of my prescription to the outside of the thermos and put it in my checked luggage.
Most hotels have fridges in the room.

There are insulin packs that would work. Just an insulated bag with ice packs on two sides. They will hold needles too.