Many people don't pay attention to saving water when staying in hotels. What can be done?

In such a society where most people have no consciousness of saving water, it is unrealistic to save water by people's own efforts. Then we can only rely on the hotel's own design or device to achieve the purpose of saving water. Judging from the bathing process in my hotel (only Hanting and other express hotels, of course, many families also do), the best way to save water is to improve the design of water outlet switch to achieve the purpose of saving water. Let's look at the problem: at present, the outlet is hot and cold. If you need a suitable shower temperature, you must adjust the switch to the right position left and right, so that there will be a suitable temperature. Then the problem is coming. It usually takes tens of seconds or even more than 1 minute from the start of adjusting the water temperature to adjusting the water temperature. This time is not a shower, so the water is wasted. Of course, this time includes the situation that the pipeline is full of cold water at the beginning, so the water wasted by the switch is not particularly large. Then I began to take a shower. Go out to get something or wear shower gel after taking a shower (there is also a waste of shower gel caused by design). then what Generally speaking, for those who save water a little, we should turn off the switch and stop the water before proceeding to the next step. However, the problem comes again. When I turn off the switch, I will inevitably swing it from side to side. At this time, the temperature of the water has changed, which is not suitable for my next shower. When I finished a series of other things, I turned on the switch and began to take a shower, which made the switch swing from side to side again and increased the water temperature. I believe that a lot of water has been wasted after repeated several times.