How much water should you be drinking daily? There are several opinions about this.
Another question is, does coffee dry out your "voice", your vocal folds? Research supposedly shows that it can. Should you avoid coffee? It depends. You can ask your doctor or you can read about it and hope that your sources are trustworthy. The more important question is are you well-hydrated?
A little not-so-nice advice I have heard is: "Pee Clear, sing clear". Maybe it is nice, if ...it is true. Another piece of advice I have heard is that if you have coffee, follow it with an equal amount of water. How much water in a day? Some say to work up to 8-10 [8 oz.] glasses of water per day. Some say 6 glasses. You have to get to know yourself. Each person is individual and has individual needs and also those vary from day to day.
What about tea and honey? Those go into your stomach and do not touch your vocal folds unless you are choking on the tea and honey. It could perhaps have a placebo effect or feel soothing to pharyngeal tissue, possibly, but your "voice" does not receive it, except for whatever makes it to the "voice" via the bloodstream.
You can read all kinds of opinions and even lies about these things, but I would advise you to talk to someone who actually knows anatomy and body function, such as a doctor or an ENT. I won't call myself an authority on these things but I will say that what I have read has come from authorities on these things.
It sounds simple enough, to practice with a purpose but what does it mean? You should have a plan with a goal in mind for every practice session. So, don't go crazy with it and decide that you are
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going to be the next Grammy winning singer at the end of a single practice session. Your purpose may be to improve something in a song or to improve an aspect of your musicianship. Maybe in a single session you won't get something perfect, which should never be a goal. Strive for improvement. Perfection is something that is very hard to even define and is best left alone. If I say perfect, it may not mean the same thing as if you say perfect.
One good reason to practice is to maintain your voice and your level of singing. Another is to improve your voice or your vocal technique or your musicianship. Some singers hate the word musicianship but that oftentimes comes from non-vocalist musicians bullying singers. It happens. You can improve your knowledge of music and its many components and terms, if you wish, but many famous singers have known little or no music or music theory. What do you want to accomplish today? Maintenance? Improvement? Learn a new song? Work on a song? Figure it before you start and you'll have a better practice session.
If you are having problems or issues with vocal technique, contact me. I have probably had to solve the same thing myself.