Originally Posted by
drvannostren
I'll have to remember to bring an empty water bottle with me from LGW-TIA, cuz I'm not gonna wanna pay like 3-4Pound at the shops in LGW either.
Bottled water and soft drinks are not expensive in UK airports - your estimate is waaaay out. Best place to buy is Boots, where you can also pick up a meal deal (sandwich/salad/sushi, snack/dessert, drink) to take on board for under £5.