I am posting this due to the wonderful enthusiasm of the developer in regards to accessibility. When I asked if this app is accessible with Talkback, this was the response I received.
"Comment from Hakanft on R/Android
Thanks for asking — and that's a really important point!
The app was built using React Native (with Expo), so it should support basic TalkBack functionality out of the box. However, I haven’t fully optimized or tested it for screen reader accessibility yet. 
Your question made me realize I need to improve this — and I will! If you're open to sharing feedback after trying it, I'd truly appreciate it."
The app itself is not only a great idea but can be extremely helpful. It is a fun way to gauge your water intake and ensure that you are drinking enough water each day. It also works with twenty-nine languages! Below is the full discussion on Reddit, ttcomplete with IOS and Android links.
https://www.reddit.com/r/Android/comments/1lzl46o/just_launched_my_free_multilingual_water_reminder/