Hydro - Water Tracker app

The design is based on the following Problem Statement :

Calorie tracking and water tracking are very popular use cases today. Water intake is in fact very important. Just a 2% decrease in body water levels has been found to decrease athletic performance by as much as 60% and cognitive performance by as much as 50%.

Design a water intake tracker where the user can track if they have drunk 8 glasses of water in a day, think and design for success and failure use cases.