I shoot for 2-3 liters a day if I'm sedentary, 4 (or more) if I'm quite active and sweating a lot. I tend not to feel thirsty until I'm completely dehydrated so I use other cues to determine my hydration: volume and color of urine, skin elasticity, whether my lips or nasal membranes are dry, etc. But mostly I just make a point to drink regularly, whether I'm thirsty or not. If I'm drinking a lot due to activity and sweating I might drop a pinch of salt in the water to ensure I maintain enough sodium.
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