It took longer to find a container that met all the Guinness specifications than it did to practice to break this record. That’s not to say it didn’t take practice, it’s just hard to find a container large enough with a small enough opening to be able to break the record.

The previous mark was 2600ml of water moved with the hands in 30 seconds. I was able t get 3375ml from one container to the other in the allotted time.

I measured it 3 different ways: 1) with the markings on the final container itself (but these weren’t granular enough) 2) by weighing the container after carefully drying off the outside and subtracting the weight of the empty container. Did you know that the relationship between 1g of water and 1ml of water is exactly 1:1 (it’s not a coincidence) and 3) I poured the water from this container into one that had more granular markings. They were all pretty close but I used the smallest of them to be safe.