Smart calculator for daily water intake

This project helps people count the daily amount of water they have drunk to make sure they are getting the right amount. The project uses a fingerprint sensor to navigate through the different options, and allows for multi-users (6 users) which is suitable for a family in one house.
The idea is to measure the
difference in water weight before and after drinking.
The screen will then display the number of millliters you have drunk, and then the amount of water you need to drink to complete the daily target which has been adjusted to 2000ml (different average daily intake can be set for adults, men or women), The device will calculate and save the amount of intake you have drunk that day, and then reset it for the new next day. Also, the device comes with a memnory to save each users information and daily intake (which can be adjusted for monthly follow-up), and you can customize the user's gender (male, female).