I've just been put on fluid restrictions because of some health problems and I have since found out that fruid restriction is very common with kidney disease, heart disease and failure and a few other issues.
I know Cronometer can track water but it's tracking total water, not just fluids which is what needs to be tracked, not what in foods. It would be very useful if I was able to track all my fluids throughout the day in volume just so I have one less app tp use. Another option (for apple at least) is to have the app read "Water" from Health.
In the end because of my health issues I'm mainly concerned with all everything under one roof. Calories, Sodium, Fluids and weight.