Young people don't take a water cup on business trips, while middle-aged people always take a water cup on business trips. I think the reasons are: first, young people are afraid of trouble and don't like to bring more things, as long as they bring more money; Second, young people don't like tea, but prefer to drink drinks and buy water when they are thirsty. There are all kinds of drinks in the shops now, which are really for young people and children. On the other hand, middle-aged people don't like to buy water to drink, let alone drink. They usually form the habit of drinking tea. Lesbians like drinking boiled water. First, they pay attention to health, and drink warm water instead of cold water. Second, they pay attention to hygiene, afraid that the water outside is not good, afraid that the hotel cups are unsanitary, and they should bring their own safety.