Well, you can use the WASD keys. And press start. Then-well, you need to double click. And then once you double click press space. The water bottles will then appear. Once you get all of them, you try to press space the water bottles will appear again. Try to get through three rounds. Once you get all the bottles then press space and they will appear. Then you get them.
Well, I got the idea from the Inventory game. And that is pretty much. It was all made by me and Scratch.