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The 8 hour trip scares me a bit as far as restroom use goes.
If it is a commercial flight there should be restrooms in front and in back. Depending on how full the flight is, however, there could be waits to get into the bathroom. This only usually occurs after food and drink is served. If you are in a situation where you need to move to the front of a line I would just tell the people in front of you that you have a medical issue and hopefully they will be understanding.
The one issue I had when I last flew (in November, to the Bahamas) was that security attempted to seize my bottled water at the airport in White Plains, NY. I protested and told them I needed the water for medical/hydration reasons. They gave me back my bottled water back after seeing the large stash of prescription antibiotics and other meds in my knapsack. They figured I must indeed have medical issues because I had all these meds.
It was later pointed out to me that Jet Blue, the airline I flew, offers complimentary bottled waters but I did not know this at the time. You might want to check with the airline and see if they offer bottled water rather than get hassled by airport security.