If you are interested in reading the scientific papers on the Drink Less app and how it was developed and evaluated, then have a look here.
The Drink Less app was a shortlisted finalist for the national Rosalind Franklin Appathon competition. This competition was funded by the Royal Society Rosalind Franklin and aimed to “recognise leading women in STEMM [Science, Technology, Engineering, Maths and Medicine] who have pioneered new apps for research, societal good and enterprise”.
Here’s a short film they made about the app and the team at UCL who developed it - https://www.youtube.com/watch?v=iWe_5M2cZmE