Yes drinking water in the morning can wake you up and water is also healthy for you.
Coffee also wakes you up in the morning but the water can also wake you up as well as hydrate you too.
Water also helps with lethargy, gives you energy as well as regulates your body, brain function and also balances your moods as well.
There's no requirement to drinking a gallon of water per day to stay healthy.
However if you want to drink a gallon of water everyday to stay healthy you certainly can as 1 gallon of water per day will keep your kidneys flushed and help prevent bladder infections, kidney disease, kidney stones etc.
Always drink water or other hydrating drinks before you get thirsty to prevent dehydration.
As long as you're drinking 1 or 2 glasses of water per day or a few bottles of water per day and drinking other healthy drinks you'll be okay.
To stay healthy you're supposed to drink at least 8 glasses of water or even 1 gallon of water per day.
However you don't have to drink 1 gallon of water everyday or even 8 glasses of water everyday.
As long as you're drinking 1 or 2 glasses of water or a few bottles of water per day you'll still keep healthy.