Lemonade is the main reason I get refillable mugs at Disney! I love the minute maid stuff!!
Our lemonade is fizzy- like soda, where as the stuff you get in America is still and delicious! We have 'old fashioned still lemonade' and lemon squash, but they just aren't the same!
BTW: They sell minute maid lemonade by the 2 liter in stores here.
Another food you might want to try if they do not have it in the UK are Pringles potatoe crisps.