As soon as I checked into the hotel, I thought

Generally speaking, drinks such as mineral water and red bull provided by hotels are usually free, but fees may be charged, which are usually indicated in the hotel's price list or the price tag on the beverage bottle.

If you are not sure whether these drinks need to be charged, it is best to consult the hotel front desk before checking in to avoid unnecessary expenses. At the same time, you can also ask the hotel staff for help. If they can provide you with detailed information about consumption activities in the hotel, they can help you manage consumption better.