The flask you bring inIv gotten flask jacked before and it was not cool.
I got into the habit of putting airplane bottles in my shoes. Its best to do something high proof and easily drinkable, therefore avoiding an 8 dollar soda as a chaser. I'm usually a whiskey drinker but I find that rumplemans works best. Its got a proof of 100 and tastes like gum so theres no chaser needed.