I decided to give you an accurate answer with practical experiments. I brought an unfinished hamburger for hotel breakfast in my bag, a bag of grapes bought in the supermarket (the kind sealed with plastic wrap), 2 bottles of unopened mineral water, an apple, 3 peaches, a bag of ham sausage, 5 spicy sausages and a bag of crispy raccoon noodles. Only that hamburger was picked out for disposal during security inspection, and the others were released at a glance. Therefore, fruits can be absolutely taken, and it doesn't matter whether mineral water is opened or not, but cooked food is absolutely forbidden to be opened. In addition, there is no need to bring a lot of water, which is full of direct drinking water.