Hi Joedoch,
I always pack double the supplies I think I'm going to need in my carry-on bag; they don't take up much space (never needed to use the extras - they're just for peace of mind).
You may have to go through the body scanners, often get a pat down and some questions, but it's all very discreet. Have been overseas many times and security differs in each country but never had any issues (Edinburgh airport - no worries at all. Heathrow is a tad chaotic but also no problems).
I try to get an aisle seat. I eat and drink as normal (I have an ileo), and empty about every 4-5 hours (normal for me) - if I skip meals, the bag tends to fill with gas, which is more of a nuisance than regular output; the less I have to go to those tiny toilets, the better. Also, because overseas flights from Oz are often up to 20-30 hours, it would be insane to fast for that amount of time. Whenever that trolley rolls through and whatever they hand to me, I'm eating it!
USA to UK is 6-8 hours? You got this mate, sit back, relax, and enjoy your time in Scotia; it's absolutely gorgeous!
Bon voyage,
Jo 😎
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Ullapool
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Helmsdale
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Glencoe
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Inverness