Hmm... interesting post and comments.
Kindly remember what works for one person may not work for another.
Mr. Google told three ways to stay hydrated.
Water... ice cold works for me because I am suffering from ageusia.
Milk... careful about the gas effect. I will drink during the day but not in the evening.
Orange juice. It was the best noted after exercising. For me, hold the pulp.
Just saying this works for me right now.
These are natural, available, and cheaper.