Hi Matheous
I hope this helps re - water intake.
Woofgang's suggestion to keep an eye on the colour of your urine - I agree with. If you aren't weeing very much then your intake of fluids is likely to be far too low and esespecially if urine is very low volume and concentrated when you do go.
I dont think you can be too rigid though as alot of things can affect how much you might need (medication, salt intake, exercise etc etc - ) Some people find that if they drink a few large glasses of water the minute they get up in the morning it replaces what they have lost during the night and they are better set for the day than if they dont do this - they really notice the difference. They also sip throughout the day and stay very hydrated. Some friends I have who drink have to drink lots of water before they go to bed or they find nothing goes right the next day! and they wake up feeling awful - water sorts this but if they wait until the morning they are stressed with headaches etc etc. and it doesn't work. Alcohol affects people differently.. But not everyone is like this. The best approach in my view is to learn to trust your own judgement and listen to what your body is telling you.
The more fluid and free your blood is moving around the body the less struggle and stress on your heart.