I've talked about this before but drink whatever you want to hydrate yourself. Water, juice, milk, hot tea, bottled tea, flavored water, Gatorade, lemonade, homemade electrolyte drinks, sparkling water, etc. Buy cirkul catridges or electrolyte packets, infuse your water with fruits or herbs or whatever, make seven smoothies a day, as long as it gets liquid in your body. ALL of that provides hydration because it's all made from water and despite some very persistent myths, it takes A LOT of sugar to cancel out water.
If you don't like plain water, and a lot of people don't and that is FINE, then it is a million times better to find beverages that you will actually drink than to be dehydrated because you keep trying to force yourself to drink something you don't like.
Obligatory disclaimer that this does NOT apply to alcohol. Another less serious disclaimer that caffeine is more complicated; coffee and energy drinks and the like will still hydrate you to a degree but less than non-caffeinated beverages and you should also be drinking other things too. Only getting your water alongside caffeine, especially if you don't eat a whole lot, can seriously fuck you up both mentally and physically. No, I'm definitely not speaking from years of experience, why do you ask?