I had to learn to pay attention to how water tastes too. Sometimes plain water is amazing and that tells me I need more of it. Still not great at this. I often find myself chugging my electrolyte drink or a full liter of water to catch up.
Sports helped build the habit. Especially playing soccer when I was young. You don't get breaks during soccer so you have to pay attention and show up hydrated. BJJ too, an hour pouring sweat with no drink break. People want revenge at BJJ, show up off your game and you will be sure to suffer.