(I love FlyerTalk . . )

Connection later this year on a UA Polais flight from IAH to a LH (biz) flight to Bergen, Norway. I have about 3 hours.

Question: Do I only go through Immigration OR do I have to go through a Security check as well? Wondering if I should empty my water bottle before getting in line for whatever I need to get in line for. Thank you! Looks like UA arrives in Terminal 1 and LH departs from the same Terminal.

And which Lounge can I use? Coming FROM Non-Schengen but TO Schengen.

Many many thanks . . . .