Is there a way to stop the flow of water on this water clock?

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To modify a water clock for stopwatch functionality, one suggestion is to create a mechanism that allows for the flow of water to be stopped or reduced significantly. A proposed method involves leaving space between the bottle caps to expose the straw or tube, enabling it to be pinched with a clothespin to halt the flow. This approach aims to slow the water to a drip, providing more control over timing. The discussion emphasizes the need for practical modifications to achieve the desired functionality. Overall, the focus is on finding effective solutions for controlling water flow in the device.
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The one in question:

Hello, I currently have to build a timer for my high school physics class. I plan on using a very similar design structure as shown in the video. However, I would like to know if there is a mechanism/modification I can do to this so that I can stop/greatly reduce the flow of water by pulling/twisting/switching something. My goal is to make this device acts more like a stopwatch than a timer.

Currently, I'm thinking the best way to do it is to somehow block the flow of air from one of the tubes so that the water slows down to a drip. I'm having a hard time figuring out how to do it though.

Any help/advice would be greatly appreciated. And sorry if this is the wrong category to post in, I'm new to this forum and this category seemed to fit best. Thanks again!
 
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I think the easiest way to do that would be to leave space between the bottle caps, so that the straw/tube is exposed. Then you can pinch it with something like a clothespin to make it stop.
 

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